40 C.F.R. § 81.305

Current through September 30, 2024

Section 81.305 - California

California-TSP

Designated area	Does not meet primary standards	Does not meet secondary standards	Cannot be classified	Better than national standards
North Coast Air Basin:
Del Norte County				X
Humboldt County				X
Mendocino County				X
Sonoma County (North Coast Air Basin portion)				X
Trinity County				X
Lake County Air Basin				X
North Central Coast Air Basin				X
South Central Coast Air Basin:
San Luis Obispo County:
Salinas Valley-El Pomar Estrella Planning Area				X
Non-Salinas Valley				X
Santa Barbara County (AQMA portion)				X
Santa Barbara County (Non-AQMA portion):
A. West area of north-south boundary separating Santa Ynez and Lompoc Valleys:
Santa Maria Area	X
Outside Santa Maria Area				X
B. East area of north-south boundary separating Santa Ynez and Lompoc Valleys			X
Ventura County:
North of 34°23' North Latitude				X
South of 34°23' North Latitude	X
Channel Islands			X
San Diego Air Basin:
San Diego County (West portion)	X
San Diego County (East portion)			X
South Coast Air Basin	X
San Joaquin Valley Air Basin	X
Sacramento Valley Air Basin (SVAB):
Sacramento County		X
Solano County (SVAB Portion)			X
Yolo County			X
Butte County			X
Colusa County			X
Glenn County			X
Shasta County (Sacramento Valley portion)				X
Sutter County			X
Tehama County			X
Yuba County			X
Great Basin Valleys Air Basin
Northeast Plateau Air Basin (NEPAB):
Shasta County (NEPAB portion)				X
Rest of Air Basin			X
Southeast Desert Air Basin:
Kern County (S.E. Desert Air Basin Portion)			X
Imperial County			X
Los Angeles County (S.E. Desert Air Basin Portion):
Lancaster Quartz Hill Area				X
Outside Lancaster Quartz Hill Area			X
Riverside County (Coachella Valley planning area)			X
Riverside County (remainder of County)
San Bernardino County (S.E. Desert AQMA Portion):
Victorville Area	X
Non-Victorville Area			X
Riverside County (non-AQMA Portion)			X
San Bernardino County (non-AQMA Portion)			X
Lake Tahoe Air Basin				X
San Francisco Bay Area Air Basin:
Solano County (S.F. Bay Area Air Basin portion)				X
San Mateo County				X
Marin County				X
Napa County				X
Sonoma County (S.F. Bay Area Air Basin portion)				X
Alameda County				X
Contra Costa County				X
San Francisco County				X
Santa Clara County		X
Rest of Air Basin		X
Mountain Counties Air Basin:
Placer County (AQMA portion)				X
Placer County (excluding AQMA portion and Lake Tahoe portion)				X
Amador County				X
Calaveras County			X
El Dorado County (excluding Lake Tahoe Air Basin portion)				X
Mariposa County			X
Nevada County			X
Plumas County				X
Sierra County				X
Tuolumne County			X

California-1971 Sulfur Dioxide NAAQS

[Primary and Secondary]

Designated area	Does not meet primary standards	Does not meet secondary standards	Cannot be classified	Better than national standards
North Coast Air Basin:
Del Norte County			X
Humboldt County			X
Mendocino County			X
Sonoma County (North Coast Basin portion)			X
Trinity County			X
Lake County Air Basin			X
San Francisco Bay Area Air Basin				X
North Central Coast Air Basin:
Monterey County			X
San Benito County			X
Santa Cruz County			X
South Central Coast Air Basin:
San Luis Obispo County			X
Santa Barbara County (AQMA portion)			X
Santa Barbara County (non-AQMA portion)			X
Ventura County				X
Channel Islands			X
San Diego Air Basin:
San Diego County (West portion)				X
San Diego County (East portion)				X
South Coast Air Basin:
Los Angeles County (South Coast Air Basin portion)				X
Orange County				X
Riverside County (South Coast Air Basin portion)				X
South Coast Basin portion of San Bernardino County
San Joaquin Valley Air Basin:
Fresno County			X
Kern County				X
Kings County			X
Madera County			X
Merced County			X
San Joaquin County			X
Stanislaus County			X
Tulare County			X
Sacramento Valley Air Basin			X
Great Basin Valley's Air Basin			X
North East Plateau Air Basin			X
Mountain Counties Air Basin			X
Southeast Desert Air Basin excluding Imperial Co			X
Imperial County				X
Lake Tahoe Air Basin				X

California-2010 Sulfur Dioxide NAAQS

[Primary]

Designated area¹	Designation
Designated area¹	Date²	Type
Great Basin Valleys Air Basin		Attainment/Unclassifiable.
Alpine County
Inyo County
Mono County
Lake County Air Basin		Attainment/Unclassifiable.
Lake County
Lake Tahoe Air Basin		Attainment/Unclassifiable.
El Dorado County (part)
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Placer County (part)
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, M.D.B. & M., and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, M.D.B. & M., thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, M.D.B. & M., to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly direction, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
Mojave Desert Air Basin		Attainment/Unclassifiable.
Kern County (part)
That portion of Kern County east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grantto the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grantto the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31 T. 28 S., R. 32E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Los Angeles County (part)
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T. 3 N and T. 2 N, San Bernardino Base and Meridian; then north along the range line common to R. 8 W and R. 9 W; then west along the township line common to T. 4 N and T. 3 N; then north along the range line common to R. 12 W and R. 13 W to the southeast corner of Section 12, T. 5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T. 5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T. 7 N and T. 6 N (point is at the northwest corner of Section 4 in T. 6 N, R. 14 W); then west along the township line common to T. 7 N and T. 6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T. 7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T. 7 N, R. 16 W; then north along the range line common to R. 16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T. 8 N and T. 7 N) then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Riverside County (part)
That portion of Riverside County which lies east of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to R. 17 E. and R. 16 E., San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through T. 8 S., R. 16 E. and T. 7 S., R. 16 E., until the Black Butte Mountain, elev. 4504'; then west and northwest along the ridge line to the southwest corner of T. 5 S., R. 14 E.; then north along the range line common to R. 14 E. and R. 13 E.; then west and northwest along the ridge line to Monument Mountain, elev. 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line
San Bernardino County (part)
That portion of San Bernardino County east and north of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E, San Bernardino Base and Meridian; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary
Mountain Counties Air Basin		Attainment/Unclassifiable.
Amador County
Calaveras County
El Dorado County (part)
All of El Dorado County except that portion included in the Lake Tahoe Air Basin
Mariposa County
Nevada County
Placer County (part)
All of Placer County except that portion included in the Lake Tahoe Air Basin and that portion included in the Sacramento Valley Air Basin
Plumas County
Sierra County
Tuolumne County
North Central Air Basin		Attainment/Unclassifiable.
Monterey County
San Benito County
Santa Cruz County
North Coast Air Basin		Attainment/Unclassifiable.
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part)
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California
Trinity County
Northeast Plateau Air Basin		Attainment/Unclassifiable.
Lassen County
Modoc County
Siskiyou County
Sacramento Valley Air Basin		Attainment/Unclassifiable.
Butte County
Colusa County
Glenn County
Placer County (part)
That portion of Placer County which lies west of Range 9 east, M.D.B. & M
Sacramento County
Shasta County
Solano County (part)
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties
Sutter County
Tehama County
Yolo County
Yuba County
Salton Sea Air Basin		Attainment/Unclassifiable.
Imperial County
Riverside County (part)
That portion of Riverside County which lies east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to R. 4 E and R. 3 E; then east along the township line common to T. 8 S and T. 7 S; then north along the range line common to R. 5 E and R. 4 E; then west along the township line common to T. 6 S and T. 7 S to the southwest corner of Section 34, T. 6 S, R. 4 E; then north along the west boundaries of Sections 34, 27, 22, 15, 10, 3, T. 6 S, R. 4 E; then west along the township line common to T. 5 S and T. 6 S; then north along the range line common to R. 4 E and R. 3 E; then west along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, T. 5 S. R. 3 E; then north along the range line common to R. 2 E and R. 3 E to the Riverside-San Bernardino County line; and west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to R. 17 E. and R. 16 E., San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through T. 8 S., R. 16 E. and T. 7 S., R. 16 E., until the Black Butte Mountain, elev. 4504'; then west and northwest along the ridge line to the southwest corner of T. 5 S., R. 14 E.; then north along the range line common to R. 14 E. and R. 13 E.; then west and northwest along the ridge line to Monument Mountain, elev. 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line
San Diego Air Basin		Attainment/Unclassifiable.
San Diego County
San Francisco Bay Area Air Basin		Attainment/Unclassifiable.
Alameda County
Contra Costa County
Marin County
Napa County
San Francisco County
San Mateo County
Santa Clara County
Solano County (part)
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties
Sonoma County (part)
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California
San Joaquin Valley Air Basin		Attainment/Unclassifiable.
Fresno County
Kern County (part)
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings County
Madera County
Merced County
San Joaquin County
Stanislaus County
Tulare County
South Central Air Basin		Attainment/Unclassifiable.
San Luis Obispo County
Santa Barbara County
Ventura County
South Coast Air Basin		Attainment/Unclassifiable.
Los Angeles County (part)
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T.3 N and T.2 N, San Bernardino Base and Meridian; then north along the range line common to R.8 W and R.9 W; then west along the township line common to T.4 N and T.3 N; then north along the range line common to R.12 W and R.13 W to the southeast corner of Section 12, T.5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T.5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T.7 N and T. 6 N (point is at the northwest corner of Section 4 in T.6 N, R. 14 W); then west along the township line common to T.7 N and T.6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T.7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T.7 N, R. 16 W; then north along the range line common to R.16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T.8 N and T.7 N); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County
Riverside County (part)
That portion of Riverside County which lies west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to R. 4 E and R. 3 E; then east along the township line common to T. 8 S and T. 7 S; then north along the range line common to R. 5 E and R. 4 E; then west along the township line common to T. 6 S and T. 7 S to the southwest corner of Section 34, T. 6 S, R. 4 E; then north along the west boundaries of Sections 34, 27, 22, 15, 10, 3, T. 6 S, R. 4 E; then west along the township line common to T. 5 S and T. 6 S; then north along the range line common to R. 4 E and R. 3 E; then west along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, T. 5 S. R. 3 E; then north along the range line common to R. 2 E and R. 3 E to the Riverside-San Bernardino County line
San Bernardino County (part)
That portion of San Bernardino County west and south of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary

¹ Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

² This date is April 9, 2018, unless otherwise noted.

California-Carbon Monoxide

Designated Area	Designation		Classification
Designated Area	Date¹	Type	Date¹	Type
Bakersfield Area:
Kern County (part)
Bakersfield Metropolitan Area (Urbanized part)	6/1/98	Attainment
Chico Area:
Butte County (part) Chico Urbanized Area (Census Bureau Urbanized part)	6/1/98	Attainment
Fresno Area:
Fresno County (part) Fresno Urbanized Area	6/1/98	Attainment
Lake Tahoe North Shore Area:
Placer County (part) That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base, and Meridian (M.D.B. & M.), and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, M.D.B. & M., thence south along the west line of Sections 3 and 10, Township 15 north, Range 16 East, M.D.B. & M., to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning	June 1, 1998	Attainment
Lake Tahoe South Shore Area:
El Dorado County (part) That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake, as described under 40 CFR 81.275	6/1/98	Attainment
Los Angeles-South Coast Air Basin Area	6/11/07	Attainment
Los Angeles County (part)-that portion of Los Angeles County which lies south and west of a line described as follows:
1. Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian;
2. Then north along the range line common to Range 8 West and Range 9 West;
3. Then west along the township line common to Township 4 North and Township 3 North;
4. Then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West;
5. Then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West;
6. Then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West);
7. Tthen west along the township line common to Township 7 North and Township 6 North;
8. Then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West;
9. Then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West;
10. Then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the township line common to Township 8 North and Township 7 North);
11. Then west along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant;
12. Then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County:
Riverside County (part)-that portion of Riverside County which lies to the west of a line described as follows:
1. Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian;
2. Then east along the township line common to Township 8 South and Township 7 South;
3. Then north along the range line common to Range 5 East and Range 4 East;
4. Then west along the township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East;
5. Then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East;
6. Then west along the township line common to Township 5 South and Township 6 South;
7. Then north along the range line common to Range 4 East and Range 3 East;
8. Then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East;
9. Then north along the range line common to Range 2 East and Range 3 East to the Riverside-San Bernardino county line.
San Bernardino County-that portion of San Bernardino County which lies south and west of a line described as follows:
1. Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian;
2. Then west along the township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Modesto Area:
Stanislaus County (part) Modesto Urbanized Area (Census Bureau Urbanized Area)	6/1/98	Attainment
Sacramento Area:
Census Bureau Urbanized Area)	6/1/98	Attainment
Placer County (part)
Sacramento County (part)
Yolo County (part)
San Diego Area:
San Diego County (part) The Western Section of Air Pollution Control District of San Diego County is defined as all that portion of San Diego County, State of California, lying westerly of the following described line:	6/1/98	Attainment
1. Beginning at the Northwest of Township 9 South, Range 1 West, San Bernardino Base and Meridian;
2. thence running Southerly along the West line of said township to the south line therof;
3. thence Easterly along said South line to the range line between Range 1 West and Range 1 East;
4. thence Southerly along said range line to the township line between Township 11 South and 12 South;
5. thence Easterly along said township line to the range line between Range 1 East and Range 2 East;
6. thence Southerly along said range line to the international boundary between the United States of America and Mexico.
San Francisco-Oakland-San Jose Area:
Urbanized Areas	6/1/98	Attainment
Alameda County (part)
Contra Costa County (part)
Marin County (part)
Napa County (part)
San Francisco County
San Mateo County (part)
Santa Clara County (part)
Solano County (part)
Sonoma County (part)
Stockton Area:
San Joaquin County (part)	6/1/98	Attainment
Stockton Urbanized Area
Great Basin Valley Air Basin		Unclassifiable/Attainment
Alpine County
Inyo County
Mono County
Lake County Air Basin
Lake County		Unclassifiable/Attainment
Mountain Counties Air Basin
Amador County		Unclassifiable/Attainment
Calaveras County		Unclassifiable/Attainment
El Dorado County (part)
excluding Lake Tahoe South Shore		Unclassifiable/Attainment
Mariposa County		Unclassifiable/Attainment
Nevada County		Unclassifiable/Attainment
Placer County (part)
excluding Lake Tahoe Air Basin portion and AQMA portion		Unclassifiable/Attainment
AQMA portion (of Placer County)		Unclassifiable/Attainment
Plumas County		Unclassifiable/Attainment
Sierra County		Unclassifiable/Attainment
Tuolumne County		Unclassifiable/Attainment
North Central Coast Air Basin
Monterey County		Unclassifiable/Attainment
San Benito County		Unclassifiable/Attainment
Santa Cruz County		Unclassifiable/Attainment
North Coast Air Basin		Unclassifiable/Attainment
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part)
Remainder of County
Trinity County
Northeast Plateau Air Basin		Unclassifiable/Attainment
Lassen County
Modoc County
Siskiyou County
Sacramento Valley Air Basin (portion)
Butte County (part)
Area other than Chico Urbanized Area (Census Bureau urbanized part)		Unclassifiable/Attainment
Colusa County		Unclassifiable/Attainment
Glenn County		Unclassifiable/Attainment
Sacramento County (part)
Area other than Census Bureau urbanized areas		Unclassifiable/Attainment
Shasta County		Unclassifiable/Attainment
Solano County (part)
Sacramento Valley Air Basin portion		Unclassifiable/Attainment
Sutter County		Unclassifiable/Attainment
Tehama County		Unclassifiable/Attainment
Yolo County (part)
Area outside Census Bureau urbanized areas		Unclassifiable/Attainment
Yuba County		Unclassifiable/Attainment
San Diego Air Basin (Remainder of)
San Diego County (part)
Remainder of County		Unclassifiable/Attainment
San Francisco Bay Area Air Basin		Unclassifiable/Attainment
Area other than urbanized Areas
Alameda County (part)
Contra Costa County (part)
Marin County (part)
Napa County (part)
San Mateo County (part)
Santa Clara County (part)
Solano County (part)
Sonoma County (part)
San Joaquin Valley Air Basin
Fresno County (part)
Outside Fresno Urbanized Area		Unclassifiable/Attainment
Kern County (part)
Area other than Bakersfield Metropolitan Area (Urbanized part)		Unclassifiable/Attainment
Kings County		Unclassifiable/Attainment
Madera County		Unclassifiable/Attainment
Merced County		Unclassifiable/Attainment
San Joaquin County (part)
Outside Stockton urbanized area		Unclassifiable/Attainment
Stanislaus County (part)
Outside Modesto Urbanized Area (Census Bureau Urbanized Area)		Unclassifiable/Attainment
Tulare County		Unclassifiable/Attainment
South Central Coast Air Basin
Channel Islands		Unclassifiable/Attainment
San Luis Obispo County		Unclassifiable/Attainment
Santa Barbara County		Unclassifiable/Attainment
Ventura County		Unclassifiable/Attainment
Southeast Desert Air Basin
Imperial County		Unclassifiable/Attainment
Kern County (part)
excluding San Joaquin Valley portion		Unclassifiable/Attainment
Los Angeles County
excluding Los Angeles - South Coast Air Basin portion		Unclassifiable/Attainment
Riverside County (part) Portion excluding Los Angeles-South Coast Air Basin		Unclassifiable/Attainment.
San Bernardino Co(part)
AQMA portion (excluding Los Angeles - South Coast Air Basin)		Unclassifiable/Attainment
Non-AQMA portion (excluding Los Angeles - South Coast Air Basin)		Unclassifiable/Attainment

¹ This date is November 15, 1990, unless otherwise noted.

California-Ozone (1-Hour Standard)⁴

Designated area	Designation		Classification
Designated area	Date¹	Type	Date¹	Type
Chico Area:
Butte County	(³)	Nonattainment	(³)	Sec. 185A Area.²
Imperial County Area:
Imperial County	11/15/90	Nonattainment	11/15/90	Sec. 185A Area.²
Los Angeles-South Coast Air Basin Area⁵	11/15/90	Nonattainment	11/15/90	Extreme.
Los Angeles County (part)	11/15/90	Nonattainment	11/15/90	Extreme.
That portion of Los Angeles County which lies south and west of a line described as follows:
1. Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian;
2. then north along the range line common to Range 8 West and Range 9 West;
3. then west along the Township line common to Township 4 North and Township 3 North;
4. then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West;
5. then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West;
6. then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West);
7. then west along the Township line common to Township 7 North and Township 6 North;
8. then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West;
9. then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West;
10. then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North);
11. then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant;
12. then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County	11/15/90	Nonattainment	11/15/90	Extreme.
Riverside County (part)	11/15/90	Nonattainment	11/15/90	Extreme.
That portion of Riverside County which lies to the west of a line described as follows:
1. Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian;
2. then east along the Township line common to Township 8 South and Township 7 South;
3. then north along the range line common to Range 5 East and Range 4 East;
4. then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East;
5. then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East;
6. then west along the Township line common to Township 5 South and Township 6 South;
7. then north along the range line common to Range 4 East and Range 3 East;
8. then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East;
9. then north along the range line common to Range 2 East and Range 3 East to the Riverside-San Bernardino County line.
San Bernardino County (part)	11/15/90	Nonattainment	11/15/90	Extreme.
That portion of San Bernardino County which lies south and west of a line described as follows:
1. Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian;
2. then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Morongo Band of Mission Indians⁶	11/15/90	Nonattainment	11/15/90	Severe-17.
Monterey Bay Area		Attainment
Monterey County
San Benito County
Santa Cruz County
Sacramento Metro Area	11/15/90	Nonattainment	6/01/95	Severe-15.
El Dorado County (part):
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part):
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian (M.D.B. & M.), and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, M.D.B. & M., thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, M.D.B. & M., to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.	11/15/90	Nonattainment	6/01/95	Severe-15.
Sacramento County	11/15/90	Nonattainment	6/01/95	Severe-15.
Solano County (part) That portion of Solano County which lies north and east of a line described as follows:	11/15/90	Nonattainment	6/01/95	Severe-15.
Description of boundary in Solano county between San Francisco and Sacramento: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34; T. 6 N., R. 2 W., M.D.B. & M., thence east along said ¹/₄ section line to the east boundary of Section 36, T. 6 N., R. 2 W., thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N., R. 1 W., thence east along a line common to T. 5 N. and T. 6 N. to the northeast corner of Section 3, T. 5 N., R. 1 E., thence south along section lines to the southeast corner of Section 10, T. 3 N., R. 1 E., thence east along section lines to the south ¹/₄ corner of Section 8, T. 3 N., R. 2 E., thence east to the boundary between Solano and Sacramento Counties	11/15/90	Nonattainment	6/01/95	Severe-15.
Sutter County (part-southern portion)South of a line connecting the northern border of Yolo Co. to the SW tip of Yuba Co. and continuing along the southern Yuba County border to Placer County.	11/15/90	Nonattainment	6/01/95	Severe-15.
Yolo County	11/15/90	Nonattainment	6/01/95	Severe-15.
San Diego Area:
San Diego County	7/28/03	Attainment
San Francisco-Bay Area	8/10/98	Nonattainment	8/10/98	Not classified/Moderate under 23 U.S.C.
			8/23/99	104(b)(2).
Alameda County	8/10/98	......do	8/23/99	Do.
Contra Costa County	8/10/98	......do	8/23/99	Do.
Marin County	8/10/98	......do	8/23/99	Do.
Napa County	8/10/98	......do	8/23/99	Do.
San Francisco County	8/10/98	......do	8/23/99	Do.
San Mateo County	8/10/98	......do	8/23/99	Do.
Santa Clara County	8/10/98	......do	8/23/99	Do.
Solano County (part)	8/10/98	......do	8/23/99	Do.
That portion of the county that lies south and west of the line described that follows: Description of boundary in Solano County between San Francisco and Sacramento: Beginning at the intersection at the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34; T.6 N., R. 2 W., M.D.B. & M., thence east along said ¹/₂ section line to the east boundary of Section 36, T. 6 N., R. 2 W., thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N., R. 1 W, thence east along a line common to T. 5 N., and T. 6 N. to the northeast corner of Section 3, T. 5 N., R. 1 E., thence south along section lines to the southeast corner of Section 10 T. 3 N., R. 1 E., thence east along section lines to the south ¹/₄ corner of Section 8 T. 3 N., R. 2 E., thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)	8/10/98	......do	8/23/99	Do.
That portion of Sonoma county which lies south and east of a line described as follows: Beginning at the south-easterly corner of the Rancho Estero Americano, being on the boundary line between Marin Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly,; northerly and easterly to its intersection with the easterly line of Granton Road; thence running along the easterly and southerly line of Granton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Ranco Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California.
East Kern County:
That portion of Kern County that lies east and south of a line described below: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East, then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County Boundary	6/21/04	Attainment
San Joaquin Valley Area:
Fresno County	11/15/90	Nonattainment	05/17/04	Extreme
Kern County (part). That portion of Kern County that lies west and north of a line described below:	11/15/90	Nonattainment	05/17/04	Extreme
Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Pliebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary:
Kings County	11/15/90	Nonattainment	05/17/04	Extreme
Madera County	11/15/90	Nonattainment	05/17/04	Extreme
Merced County	11/15/90	Nonattainment	05/17/04	Extreme
San Joaquin County	11/15/90	Nonattainment	05/17/04	Extreme
Stanislaus County	11/15/90	Nonattainment	05/17/04	Extreme
Tulare County	11/15/90	Nonattainment	05/17/04	Extreme
Santa Barbara-Santa Maria-Lompoc Area:
Santa Barbara County	8/8/03	Attainment
Southeast Desert Modified AQMA Area	11/15/90	Nonattainment	11/15/90	Severe-17.
Los Angeles County (part)-that portion of Los Angeles County which lies north and east of a line described as follows:
1. Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian;
2. then north along the range line common to Range 8 West and Range 9 West;
3. then west along the Township line common to Township 4 North and Township 3 North;
4. then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West;
5. then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West;
6. then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West);
7. then west along the Township line common to Township 7 North and Township 6 North;
8. then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West;
9. then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West;
10. then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North);
11. then west along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant;
12. then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Riverside County	11/15/90	Nonattainment	11/15/90	Severe-17
Coachella Valley planning area-that portion of Riverside County which lies to the east of a line described as follows:
1. Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian;
2. then east along the Township line common to Township 8 South and Township 7 South;
3. then north along the range line common to Range 5 East and Range 4 East;
4. then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East;
5. then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East;
6. then west along the Township line common to Township 5 South and Township 6 South;
7. then north along the range line common to Range 4 East and Range 3 East;
8. then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East;
9. then north along the range line common to Range 2 East and Range 3 East to the Riverside-San Bernardino County line and that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows:
10. Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian;
11. then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504 feet;
12. then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East;
13. then north along the range line common to Range 14 East and Range 13 East;
14. then west and northwest along the ridge line to Monument Mountain, elevation 4834 feet;
15. then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elevation 5814 feet;
16. then northwest along the ridge line to the Riverside-San Bernardino County line
San Bernadino County (part)-that portion of San Bernardino County which lies north and east of a line described as follows:	11/15/90	Nonattainment	11/15/90	Severe-17.
1. Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian;
2. then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; and that portion of San Bernardino County which lies south and west of a line described as follows:
3. latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Ventura County Area:
Ventura County	11/15/90	Nonattainment	11/15/90	Severe-15.
Yuba City Area:
Sutter County (part-northern portion)	(³)	Nonattainment	(³)	Sec. 185A Area.2.
North of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County.
Yuba County	(³)	Nonattainment	(³)	Sec. 185A Area.2.
Great Basin Valleys Air Basin		Unclassifiable/Attainment
Alpine County
Inyo County
Mono County
Lake County Air Basin		Unclassifiable/Attainment
Lake County
Lake Tahoe Air Basin		Unclassifiable/Attainment
El Dorado County (part)
Lake Tahoe Area: As described under 40 CFR 81.275 .
Placer County (part)
Lake Tahoe Area: As described under 40 CFR 81.275 .
Mountain Counties Air Basin (Remainder of):
Amador County	11/15/90	Unclassifiable/Attainment	11/15/90
Calaveras County	11/15/90	Unclassifiable/Attainment	11/15/90
Mariposa County		Unclassifiable/Attainment
Nevada County		Unclassifiable/Attainment
Plumas County		Unclassifiable/Attainment
Sierra County		Unclassifiable/Attainment
Tuolumne County		Unclassifiable/Attainment
North Coast Air Basin		Unclassifiable/Attainment
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part)
Remainder of County
Trinity County
Northeast Plateau Air Basin		Unclassifiable/Attainment
Lassen County
Modoc County
Siskiyou Couny
Sacramento Valley Air Basin (Remainder of):
Colusa County		Unclassifiable/Attainment
Glenn County		Unclassifiable/Attainment
Shasta County		Unclassifiable/Attainment
Tehama County		Unclassifiable/Attainment
South Central Coast Air Basin (Remainder of):
Channel Islands		Unclassifiable/Attainment
San Luis Obispo County		Unclassifiable/Attainment
Southeast Desert NON-AQMA:
Riverside County (part)
Remainder of county		Unclassifiable/Attainment
San Bernadino County (part)
Remainder of county		Unclassifiable/Attainment

¹ This date is October 18, 2000 unless otherwise noted.

² An area designated as an ozone nonattainment area as of the date of enactment of the CAAA of the 1990 that did not violate the ozone NAAQS during the period of 1987-1989.

³ This date is January 16, 2001.

⁴ The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in California. The Monterey Bay, San Diego, and Santa Barbara-Santa Maria-Lompoc areas are maintenance areas for the 1-hour NAAQS for purposes of 40 CFR part 51 subpart X.

⁵ Excludes Morongo Band of Mission Indians' Indian country in Riverside County.

⁶ Includes Indian country of the tribe listed in this table. Information pertaining to areas of Indian country in this table is intended for CAA planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.

California-PM-10

Designated Area	Designation		Classification
Designated Area	Date	Type	Date	Type
Inyo County
Coso Junction planning area	October 4, 2010	Attainment
That portion of Inyo County contained within Hydrologic Unit #18090205
Owens Valley planning area	11/15/90	Nonattainment	02/08/93	Serious
Hydrologic Unit #18090103
Sacramento County	10/28/2013	Attainment.
San Bernardino County:
San Bernardino (part):
Excluding that portion located in the Trona planning area and excluding that portion located in the South Coast Air Basin	1/20/94	Nonattainment	1/20/94	Moderate.
Trona planning area: That portion of San Bernardino County contained within Hydrologic Unit #18090285	9/5/02	Nonattainment	9/5/02	Moderate
Mono County
Mammoth Lakes planning area	11/4/15	Attainment
Includes the following sections:
a. Sections 1-12, 17, and 18 of Township T4S, R28E;
b. Sections 25-36 of Township T3S, R28E;
c. Sections 25-36 of Township T3S, R27E;
d. Sections 1-18 of Township T4S, R27E; and,
e. Sections 25 and 36 of Township T3S, R26E.
Mono Basin
Hydrologic Unit 1809010	12/29/93	Nonattainment	12/29/93	Moderate
Fresno, Kern, Kings, Madera, Merced, San Joaquin, Stanislaus, Tulare Counties:
Indian Wells Valley planning area: That portion of Kern County contained within Hydrologic Unit #18090205	6/6/03	Attainment
San Joaquin Valley Air Basin; Fresno County, Kings County, Madera County, Merced County, San Joaquin County, Stanislaus County, Tulare County, and that portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary	12/12/08	Attainment
East Kern: That portion of Kern County which lies between the following two lines (with the exception of that portion in Hydrologic Unit Number 18090205-the Indian Wells Valley):	11/15/90	Nonattainment	02/08/93	Serious.
(1) West and north of a line described as follows: Beginning at the southwest corner of section 31, T. 10 N 16 W and running east to the northwest boundary of the Rancho La Liebre Land Grant; then running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to R. 15 W. and R. 16 W., San Bernardino Base and Meridian; then north along the range line to the northwest corner of section 2, T. 32 S., R. 32 E., Mount Diablo Base and Meridian; then east along the township line common to T. 32 S. and T. 31 S.; then north along the range line common to R. 35 E. and R. 34 E.; then east along the township line common to T. 29 S. and T. 28 S.; then north along the range line common to R. 36 E. and R. 35 E.; then east along the township line common to T. 28 S. and T. 27 S.; then north along the range line common to R. 37 E. and R. 36 E. to the Kern-Tulare County boundary
(2) East and south of a line of a line described as follows: Beginning at the southwest corner of section 31, T. 10 N 16 W and running north along the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Riverside, Los Angeles, Orange, and San Bernardino Counties
South Coast Air Basin	7/26/13	Attainment
Riverside County
Coachella Valley planning area	11/15/90	Nonattainment	02/08/93	Serious.
Imperial County:
Imperial Valley planning area: That portion of Imperial County that is defined as follows:	10/19/2020	Attainment
Commencing at the southwest corner of Imperial County and extending north along the Imperial-San Diego County line to the northwest corner of Imperial County; then east along the Imperial-Riverside County line to the point of intersection of the eastern boundary line of Hydrologic Unit #18100200; then southeasterly along the eastern boundary line of Hydrologic Unit #18100200 to the Imperial County-Mexico Border; then west along the Imperial County-Mexico Border to the point of the beginning.
Rest of State	11/15/90	Unclassifiable

California-1997 Annual PM_2.5 NAAQS

[Primary and Secondary]

Designated area	Designation^a		Classification
Designated area	Date¹	Type	Date²	Type
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part)		Nonattainment		Moderate
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County		Nonattainment		Moderate.
Riverside County (part)		Nonattainment		Moderate.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line
San Bernardino County (part)		Nonattainment		Moderate.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary
San Diego, CA:
San Diego County		Unclassifiable/Attainment
San Joaquin Valley, CA:
Fresno County		Nonattainment	5/7/15	Serious.
Kern County (part)		Nonattainment	5/7/15	Serious.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings County		Nonattainment	5/7/15	Serious.
Madera County		Nonattainment	5/7/15	Serious.
Merced County		Nonattainment	5/7/15	Serious.
San Joaquin County		Nonattainment	5/7/15	Serious.
Stanislaus County		Nonattainment	5/7/15	Serious.
Tulare County		Nonattainment	5/7/15	Serious.
North Coast Air Basin:
Del Norte County		Unclassifiable/Attainment
Humboldt County		Unclassifiable/Attainment
Mendocino County		Unclassifiable/Attainment
Sonoma County (part)		Unclassifiable/Attainment
That portion of Sonoma county which lies north and west of a line described as follows: Beginning at the south-easterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly; northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California
Trinity County	3/7/11	Unclassifiable/Attainment
Northeast Plateau Air Basin:
Lassen County	3/7/11	Unclassifiable/Attainment
Modoc County	3/7/11	Unclassifiable/Attainment
Siskiyou County	3/7/11	Unclassifiable/Attainment
Lake County Air Basin:
Lake County		Unclassifiable/Attainment
Upper Sacramento Valley Region:
Butte County (remainder)	3/7/11	Unclassifiable/Attainment
Colusa County		Unclassifiable/Attainment
Glenn County		Unclassifiable/Attainment
Shasta County	3/7/11	Unclassifiable/Attainment
Sutter County (part)		Unclassifiable/Attainment
Tehama County	3/7/11	Unclassifiable/Attainment
Yuba County (remainder)	3/7/11	Unclassifiable/Attainment
Sacramento Metropolitan Region:
El Dorado County (part)		Unclassifiable/Attainment
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Placer County (part)		Unclassifiable/Attainment
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
Sacramento County		Unclassifiable/Attainment
Solano County (part)		Unclassifiable/Attainment
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1/4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties
Sutter County (part)		Unclassifiable/Attainment
That portion south of a line connecting the northern border of Yolo County to the southwest tip of Yuba County and continuing along the southern Yuba County border to Placer County
Yolo County		Unclassifiable/Attainment
Northern Mountain Counties:
Nevada County		Unclassifiable/Attainment.
Plumas County	3/7/11	Unclassifiable/Attainment
Sierra County	3/7/11	Unclassifiable/Attainment
Central Mountain Counties:
Amador County		Unclassifiable/Attainment
Calaveras County		Unclassifiable/Attainment
Southern Mountain Counties:
Mariposa County		Unclassifiable/Attainment
Tuolumne County		Unclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (part)		Unclassifiable/Attainment
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part)		Unclassifiable/Attainment
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
San Francisco Bay Area Air Basin:
Alameda County		Unclassifiable/Attainment
Contra Costa County		Unclassifiable/Attainment
Marin County		Unclassifiable/Attainment
Napa County		Unclassifiable/Attainment
San Francisco County		Unclassifiable/Attainment
San Mateo County		Unclassifiable/Attainment
Santa Clara County		Unclassifiable/Attainment
Solano County (part)		Unclassifiable/Attainment
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties
Sonoma County (part)		Unclassifiable/Attainment.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties
North Central Coast Air Basin:
Monterey County		Unclassifiable/Attainment
San Benito County		Unclassifiable/Attainment
Santa Cruz County		Unclassifiable/Attainment
San Luis Obispo County:
San Luis Obispo County		Unclassifiable/Attainment
Santa Barbara County:
Santa Barbara County (part)		Unclassifiable/Attainment
Excluding San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands
Santa Barbara County (part)		Unclassifiable/Attainment
San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands.
Ventura County:
Ventura County (part)		Unclassifiable/Attainment
Excluding Anacapa and San Nicolas Islands.
Ventura County (part)		Unclassifiable/Attainment
Anacapa and San Nicolas Islands.
Great Basin Valleys Air Basin:
Alpine County		Unclassifiable/Attainment
Inyo County (part)		Unclassifiable/Attainment
That portion of Inyo County that lies outside Hydrologic Unit Number 18090205.
Mono County		Unclassifiable/Attainment
Coso Junction:
Inyo County (part)		Unclassifiable/Attainment
That portion of Inyo County that lies inside Hydrologic Unit Number 18090205.
Eastern Kern County:
Kern County (part)		Unclassifiable/Attainment
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205-the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Indian Wells Valley:
Kern County (part)		Unclassifiable/Attainment
That portion of Kern County that lies inside Hydrologic Unit Number 18090205.
Western Mojave Desert and Antelope Valley:
Los Angeles County (part)		Unclassifiable/Attainment
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Trona:
San Bernardino County (part)		Unclassifiable/Attainment
That portion of San Bernardino County that lies inside Hydrologic Unit Number 18090205.
Coachella Valley:
Riverside County (part)		Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East;, to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504'; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line.
Far Eastern Riverside and San Bernardino Counties:
San Bernardino County (remainder)		Unclassifiable/Attainment
Riverside County (remainder)		Unclassifiable/Attainment.
Imperial County:
Imperial County		Unclassifiable/Attainment.

^a Includes Indian Country located in each county or area, except as otherwise specified.

¹ This date is 90 days after January 5, 2005, unless otherwise noted.

² This date is July 2, 2014, unless otherwise noted.

California-2012 Annual PM_2.5 NAAQS

[Primary]

Designated area¹	Designation		Classification
Designated area¹	Date²	Type	Date²	Type
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part)		Nonattainment	12/9/20	Serious.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County		Nonattainment	12/9/20	Serious.
Riverside County (part): That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line (excluding the lands of the Santa Rosa Band of Cahuilla Mission Indians, and excluding the lands of the Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation)		Nonattainment	12/9/20	Serious.
San Bernardino County (part)		Nonattainment	12/9/20	Serious.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary
Imperial County, CA:
Imperial County (part)		Nonattainment		Moderate.
That portion of Imperial County which lies within the line described as follows: (San Bernardino Base and Meridian) Beginning at the intersection of the United States-Mexico border and the southeast corner of Township 17 South, Range 11 East, then north along the range line of the eastern edge of Range 11 East, then east along the township line of the southern edge of Township 12 South to the northeast corner of Township 13 South, Range 15 East, then south along the range line common to Range 15 East and Range 16 East, to the United States-Mexico border
San Joaquin Valley, CA:
Fresno County		Nonattainment		Moderate.
Kern County (part)		Nonattainment		Moderate.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon Land Grant boundary line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Kings County		Nonattainment		Moderate.
Madera County		Nonattainment		Moderate.
Merced County		Nonattainment		Moderate.
San Joaquin County		Nonattainment		Moderate.
Stanislaus County		Nonattainment		Moderate.
Tulare County		Nonattainment		Moderate.
Plumas County, CA
Plumas County (part)		Nonattainment	January 30, 2023	Serious.
That portion of Plumas County within the following Super Planning Watersheds (SPWS), as defined by the State of California's Department of Conservation Statewide Watershed Program: Humbug Valley (#55183301), Sulpher Creek (#55183302), Frazier Creek (#55183303), and Eureka Lake (#55183304)
San Diego Air Basin, CA:
San Diego County (excluding the lands of the Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation)		Unclassifiable/Attainment
North Coast Air Basin:
Del Norte County		Unclassifiable/Attainment
Humboldt County		Unclassifiable/Attainment
Mendocino County		Unclassifiable/Attainment
Sonoma County (part)		Unclassifiable/Attainment
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeast corner of the Rancho Estero Americano Land Grant on the boundary line between Marin and Sonoma Counties; then running north along the east boundary line of Rancho Estero Americano Land Grant to the northeast corner thereof, being an angle corner in the westerly boundary line of the Rancho Canada de Jonive Land Grant, then running along the boundary of the Rancho Canada de Jonive Land Grant west, north and east to its intersection with the eastern line of Graton Road; then running along the east and south line of Graton Road north and east to its intersection with the east line of Sullivan Road; then running north along the east line of Sullivan Road to the southern line of Green Valley Road; then running east along the southern line of Green Valley Road and east along the southern line of State Highway 116, to the west and north line of Vine Hill Road; then running along the west and north line of Vine Hill Road, north and east to its intersection with the west line of Laguna Road; then running north along the west line of Laguna Road and the north projection thereof to the north line of Trenton Road; then running west along the north line of Trenton Road to the east line of Trenton-Healdsburg Road to the east line of Eastside Road; then running north along the east line of Eastside Road to its intersection with the southern line of Rancho Sotoyome Land Grant; then running east along the southern line of Rancho Sotoyome Land Grant to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Base and Meridian; then running east along the township line to its intersection with the boundary line between Sonoma and Napa Counties
Trinity County		Unclassifiable/Attainment
Northeast Plateau Air Basin, CA:
Lassen County		Unclassifiable/Attainment
Modoc County		Unclassifiable/Attainment
Siskiyou County		Unclassifiable/Attainment
Lake County Air Basin, CA:
Lake County		Unclassifiable/Attainment
Sacramento Valley Air Basin, CA:
Butte County		Unclassifiable/Attainment
Colusa County		Unclassifiable/Attainment
Glenn County		Unclassifiable/Attainment
Placer County (part)		Unclassifiable/Attainment
That portion of Placer County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to Township 12 North, Range 9 East and Township 13 North, Range 9 East, then running west along the township line common to Township 12 North, Range 9 East and Township 13 North, Range 9 East, then north along the range line common to Range 8 East and Range 9 East, to the Placer-Nevada County boundary
Sacramento County		Unclassifiable/Attainment
Shasta County		Unclassifiable/Attainment
Solano County (part)		Unclassifiable/Attainment
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, then east along said ¹/₄ section line to the east boundary of Section 36, Township 6 North, Range 2 West, then south ¹/₂ mile and east 2 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, then east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, then south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, then east along section lines to the south ¹/₄ corner of Section 8, Township 3 North, Range 2 East, then east to the boundary between Solano and Sacramento Counties
Sutter County		Unclassifiable/Attainment
Tehama County		Unclassifiable/Attainment
Yolo County		Unclassifiable/Attainment
Yuba County		Unclassifiable/Attainment
Mountain Counties:
Amador County		Unclassifiable/Attainment
Calaveras County		Unclassifiable/Attainment
El Dorado (part)		Unclassifiable/Attainment
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Mariposa County		Unclassifiable/Attainment
Nevada County		Unclassifiable/Attainment
Placer (part)		Unclassifiable/Attainment
That portion of Placer County which is contained inside the two boundaries described as follows: 1. That portion of the county that lies east of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to Township 12 North, Range 9 East and Township 13 North, Range 9 East, then running west along the township line common to Township 12 North, Range 9 East and Township 13 North, Range 9 East, then north along the range line common to Range 8 East and Range 9 East, to the Placer-Nevada County boundary. 2. That portion of the county that lies west of the drainage area naturally tributary to Lake Tahoe including said Lake, plus west of the boundary of that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
Plumas County (remainder)		Unclassifiable/Attainment
Sierra County		Unclassifiable/Attainment
Tuolumne County		Unclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (part)		Unclassifiable/Attainment
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Placer County (part)		Unclassifiable/Attainment
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: commencing at the point common to the aforementioned drainage area crestline and the line common to Township 15 North and Township 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, then south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, then following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, then following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
San Francisco Bay Area Air Basin:
Alameda County		Unclassifiable/Attainment
Contra Costa County		Unclassifiable/Attainment
Marin County		Unclassifiable/Attainment
Napa County		Unclassifiable/Attainment
San Francisco County		Unclassifiable/Attainment
San Mateo County		Unclassifiable/Attainment
Santa Clara County		Unclassifiable/Attainment
Solano County (part)		Unclassifiable/Attainment
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, then east along said ¹/₄ section line to the east boundary of Section 36, Township 6 North, Range 2 West, then south ¹/₂ mile and east 2 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, then east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, then south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, then east along section lines to the south ¹/₄ corner of Section 8, Township 3 North, Range 2 East, then east to the boundary between Solano and Sacramento Counties
Sonoma County (part)		Unclassifiable/Attainment
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeast corner of the Rancho Estero Americano Land Grant on the boundary line between Marin and Sonoma Counties; then running north along the east boundary line of Rancho Estero Americano Land Grant to the northeast corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive Land Grant, then running along the boundary of Rancho Canada de Jonive Land Grant west, north and east to its intersection with the eastern line of Graton Road; then running along the east and south line of Graton Road north and east to its intersection with the east line of Sullivan Road; then running north along the east line of Sullivan Road to the southern line of Green Valley Road; then running east along the southern line of Green Valley Road and east along the southern line of State Highway 116, to the west and north line of Vine Hill Road; then running along the west and north line of Vine Hill Road, north and east to its intersection with the west line of Laguna Road; then running north along the west line of Laguna Road and the north projection thereof to the north line of Trenton Road; then running west along the north line of Trenton Road to the east line of Trenton-Healdsburg Road to the east line of Eastside Road; then running north along the east line of Eastside Road to its intersection with the southern line of Rancho Sotoyome Land Grant; then running east along the southern line of Rancho Sotoyome Land Grant to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Base and Meridian; then running east along the township line to its intersection with the boundary line between Sonoma and Napa Counties
North Central Coast Air Basin:
Monterey County		Unclassifiable/Attainment
San Benito County		Unclassifiable/Attainment
Santa Cruz County		Unclassifiable/Attainment
South Central Coast Air Basin:
San Luis Obispo County		Unclassifiable/Attainment
Santa Barbara County		Unclassifiable/Attainment
Ventura County		Unclassifiable/Attainment
Great Basin Valleys Air Basin:
Alpine County		Unclassifiable/Attainment
Inyo County		Unclassifiable/Attainment
Mono County		Unclassifiable/Attainment
Mojave Desert Air Basin:
Kern County (part)		Unclassifiable/Attainment
That portion of Kern County east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon Land Grant boundary line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Los Angeles County (remainder)		Unclassifiable/Attainment
Riverside County (part)		Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, Elevation 45'05"; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line
San Bernardino County (remainder)		Unclassifiable/Attainment
Salton Sea Air Basin:
Imperial County (remainder)		Unclassifiable/Attainment
Riverside County (part)		Unclassifiable/Attainment
That portion of Riverside County (including the lands of the Santa Rosa Band of Cahuilla Mission Indians within Riverside County) which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East;, to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504'; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line
Pechanga Band of Luiseno Mission Indians		Unclassifiable/Attainment

¹ Includes areas of Indian country located in each county or area, except as otherwise specified.

² This date is April 15, 2015, unless otherwise noted.

California-1997 24-Hour PM_2.5 NAAQS

[Primary and Secondary]

Designated area	Designation^a		Classification
Designated area	Date¹	Type	Date²	Type
Chico, CA:
Butte County (part)		Unclassifiable/Attainment
That portion of Butte County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Butte-Yuba county line and the township line common to T18N R6E and T19N R6E, west to the township line common to T18N R6E and T19N R6E, then north along the range line common to R5E and R6E, then west along the township line common to T21N and T20N, then north along the range line common to R4E and R5E, then west along the township line common to T24N and T23N to the Butte-Tehama County boundary.
Imperial County, CA:
Imperial County (part)		Unclassifiable/Attainment
That portion of Imperial County which lies within the line described as follows: (San Bernardino Base and Meridan) Beginning at the intersection of the United States-Mexico border and the southeast corner of T17S R11E, then north along the range line of the eastern edge of range R11E, then east along the township line of the southern edge of T12S to the northeast corner of T13S R15E, then south along the range line common to R15E and R16E, to the United States-Mexico border.
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part)		Nonattainment		Moderate.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then North along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County		Nonattainment		Moderate.
Riverside County (part)		Nonattainment		Moderate.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County Line (excluding the lands of the Santa Rosa Band of Cahuilla Mission Indians).
That part of the lands of the Santa Rosa Band of Cahuilla Mission Indians which is excluded from the Riverside County (part) nonattainment area		Nonattainment		Moderate.
San Bernardino County (part)		Nonattainment		Moderate.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Sacramento, CA:
El Dorado County (part)		Unclassifiable/Attainment
That portion of El Dorado County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of El Dorado-Amador county line and the township line common to townships T8N R10E and T8N R11E, then north along the range line common to ranges R10E and R11E, then east along the township line common to T9N and T8N, then north along the range line common to ranges R12E and R13E, then west along the township line common to T12N and T11N, then north along the range line common to ranges R10E and R11E, then west along the township line common to T13N and T12N, then north along the range line common to ranges R9E and R10E, to the El Dorado-Placer County boundary.
Placer County (part)		Unclassifiable/Attainment
That portion of Placer County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to townships T12N R9E and T13N R9E, then running west along the township line common to townships T12N R9E and T13N R9E, then north along the range line common to ranges R8E and R9E, to the Placer-Nevada County boundary.
Sacramento County		Unclassifiable/Attainment
Solano County (part)		Unclassifiable/Attainment
That portion of Solano County which lies north and east of a line described as follows: beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said ¹/₄ section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south ¹/₄ corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Yolo County (part)		Unclassifiable/Attainment
That portion of Yolo County which lies east of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of Yolo-Solano County boundary and the range line of the eastern edge of township T8N R2W, north along the range line of the eastern edge of township T8N R2W, continuing north along the range line common to ranges R2W and R1W, to the Yolo-Colusa County boundary.
San Francisco Bay Area, CA:
Alameda County		Unclassifiable/Attainment
Contra Costa County		Unclassifiable/Attainment
Marin County		Unclassifiable/Attainment
Napa County		Unclassifiable/Attainment
San Francisco County		Unclassifiable/Attainment
San Mateo County		Unclassifiable/Attainment
Santa Clara County		Unclassifiable/Attainment
Solano County (part)		Unclassifiable/Attainment
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said ¹/₄ section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south ¹/₄ corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)		Unclassifiable/Attainment.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
San Joaquin Valley, CA:
Fresno County		Nonattainment	5/7/15	Serious.
Kern County (part)		Nonattainment	5/7/15	Serious.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings County		Nonattainment	5/7/15	Serious.
Madera County		Nonattainment	5/7/15	Serious.
Merced County		Nonattainment	5/7/15	Serious.
San Joaquin County		Nonattainment	5/7/15	Serious.
Stanislaus County		Nonattainment	5/7/15	Serious.
Tulare County		Nonattainment	5/7/15	Serious.
Yuba City-Marysville, CA:
Sutter County		Unclassifiable/Attainment
Yuba County (part)		Unclassifiable/Attainment
That portion of Yuba County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Yuba-Nevada county line and the range line common to ranges R7E and R8E, north to the southeast corner of township T18N R7E, then west along the township line common to T17N and T18N, then north along the range line common to ranges R6E and R7E, then west along the township line common to T19N and T18N to the Yuba-Butte County boundary.
North Coast Air Basin:
Del Norte County		Unclassifiable/Attainment
Humboldt County		Unclassifiable/Attainment
Mendocino County		Unclassifiable/Attainment
Sonoma County (part)		Unclassifiable/Attainment
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly; northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California.
Trinity County		Unclassifiable/Attainment
Northeast Plateau Air Basin:
Lassen County		Unclassifiable/Attainment
Modoc County		Unclassifiable/Attainment.
Siskiyou County		Unclassifiable/Attainment
Lake County Air Basin:
Lake County		Unclassifiable/Attainment
Upper Sacramento Valley Region:
Butte County (remainder)		Unclassifiable/Attainment
Colusa County		Unclassifiable/Attainment
Glenn County		Unclassifiable/Attainment
Shasta County		Unclassifiable/Attainment
Tehama County		Unclassifiable/Attainment
Yuba County (remainder)		Unclassifiable/Attainment
Sacramento Metropolitan Region:
Yolo County (remainder)		Unclassifiable/Attainment
Northern Mountain Counties:
Nevada County		Unclassifiable/Attainment
Plumas County		Unclassifiable/Attainment
Sierra County		Unclassifiable/Attainment
Central Mountain Counties:
Amador County		Unclassifiable/Attainment
Calaveras County		Unclassifiable/Attainment
Southern Mountain Counties:
Mariposa County		Unclassifiable/Attainment
Tuolumne County		Unclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (remainder)		Unclassifiable/Attainment
Placer County (remainder)		Unclassifiable/Attainment
North Central Coast Air Basin:
Monterey County		Unclassifiable/Attainment
San Benito County		Unclassifiable/Attainment
Santa Cruz County		Unclassifiable/Attainment
San Luis Obispo County:
San Luis Obispo County		Unclassifiable/Attainment
Santa Barbara County:
Santa Barbara County (part)		Unclassifiable/Attainment
Excluding San Miguel, Santa Rosa, Santa Cruz and Santa Barbara Islands
Santa Barbara County (part)		Unclassifiable/Attainment
San Miguel, Santa Rosa, Santa Cruz and Santa Barbara Islands
Ventura County:
Ventura County (part)		Unclassifiable/Attainment
Excluding Anacapa and San Nicolas Islands.
Ventura County (part)		Unclassifiable/Attainment
Anacapa and San Nicolas Islands.
Great Basin Valleys Air Basin:
Alpine County		Unclassifiable/Attainment
Inyo County (part)		Unclassifiable/Attainment
That portion of Inyo County that Lies outside Hydrologic Unit Number 18090205.
Mono County		Unclassifiable/Attainment
Coso Junction:
Inyo County (part)		Unclassifiable/Attainment
That portion of Inyo County that lies inside Hydrologic Unit Number 18090205.
Eastern Kern County:
Kern County (part)		Unclassifiable/Attainment
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205-the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; Then northwest Along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Indian Wells Valley:
Kern County (part)		Unclassifiable/Attainment
That portion of Kern County that lies inside Hydrologic Unit Number 18090205.
Western Mojave Desert and Antelope Valley:
Los Angeles County (part)		Unclassifiable/Attainment
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
San Bernardino County (part)		Unclassifiable/Attainment
That portion of San Bernardino County (with the exception of that portion in Hydrologic Unit Number 18090205) which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; And that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Trona:
San Bernardino County (part)		Unclassifiable/Attainment
That portion of San Bernardino County that lies inside Hydrologic Unit Number 18090205.
Coachella Valley:
Riverside County (part)		Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then North along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, Elevation 4504'; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line.
Far Eastern Riverside and San Bernardino Counties:
San Bernardino County (remainder)		Unclassifiable/Attainment.
Riverside County (remainder)		Unclassifiable/Attainment.
Imperial County (remainder)		Unclassifiable/Attainment
San Diego County		Unclassifiable/Attainment

^a Includes Indian Country located in each county or area, except as otherwise specified.

¹ This date is 90 days after January 5, 2005, unless otherwise noted.

² This date is July 2, 2014, unless otherwise noted.

California-2006 24-Hour PM_2.5 NAAQS

[Primary and Secondary]

Designated area	Designation^a		Classification
Designated area	Date¹	Type	Date²	Type
Chico, CA:
Butte County (part)	August 10, 2018	Attainment
That portion of Butte County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Butte-Yuba county line and the township line common to T18N R6E and T19N R6E, west to the township line common to T18N R6E and T19N R6E, then north along the range line common to R5E and R6E, then west along the township line common to T21N and T20N, then north along the range line common to R4E and R5E, then west along the township line common to T24N and T23N to the Butte-Tehama County boundary
Imperial County, CA:
Imperial County (part)		Nonattainment		Moderate.
That portion of Imperial County which lies within the line described as follows: (San Bernardino Base and Meridian) Beginning at the intersection of the United States-Mexico border and the southeast corner of T17S R11E, then north along the range line of the eastern edge of range R11E, then east along the township line of the southern edge of T12S to the northeast corner of T13S R15E, then south along the range line common to R15E and R16E, to the United States-Mexico border.
Los Angeles-South Coast Air Basin, CA:
Los Angeles County (part)		Nonattainment	02/12/16	Serious.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then North along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary		Nonattainment	02/12/16	Serious.
Orange County		Nonattainment	02/12/16	Serious.
Riverside County (part)		Nonattainment	02/12/16	Serious.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County Line (excluding the lands of the Santa Rosa Band of Cahuilla Mission Indians)		Nonattainment	02/12/16	Serious.
That part of the lands of the Santa Rosa Band of Cahuilla Mission Indians which is excluded from the Riverside County (part) nonattainment area		Unclassifiable/Attainment
San Bernardino County (part)		Nonattainment	02/12/16	Serious.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary		Nonattainment	02/12/16	Serious.
Sacramento, CA:
El Dorado County (part)		Nonattainment		Moderate.
That portion of El Dorado County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of El Dorado-Amador county line and the township line common to townships T8N R10E and T8N R11E, then north along the range line common to ranges R10E and R11E, then east along the township line common to T9N and T8N, then north along the range line common to ranges R12E and R13E, then west along the township line common to T12N and T11N, then north along the range line common to ranges R10E and R11E, then west along the township line common to T13N and T12N, then north along the range line common to ranges R9E and R10E, to the El Dorado-Placer County boundary.
Placer County (part)		Nonattainment		Moderate.
That portion of Placer County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Placer-El Dorado County line and the township line common to townships T12N R9E and T13N R9E, then running west along the township line common to townships T12N R9E and T13N R9E, then north along the range line common to ranges R8E and R9E, to the Placer-Nevada County boundary.
Sacramento County		Nonattainment		Moderate.
Solano County (part)		Nonattainment		Moderate.
That portion of Solano County which lies north and east of a line described as follows: beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south 1/4 corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Yolo County (part)		Nonattainment		Moderate.
That portion of Yolo County which lies east of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of Yolo-Solano County boundary and the range line of the eastern edge of township T8N R2W, north along the range line of the eastern edge of township T8N R2W, continuing north along the range line common to ranges R2W and R1W, to the Yolo-Colusa County boundary.
San Francisco Bay Area, CA:
Alameda County		Nonattainment		Moderate.
Contra Costa County		Nonattainment		Moderate.
Marin County		Nonattainment		Moderate.
Napa County		Nonattainment		Moderate.
San Francisco County		Nonattainment		Moderate.
San Mateo County		Nonattainment		Moderate.
Santa Clara County		Nonattainment		Moderate.
Solano County (part)		Nonattainment		Moderate.
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said 1/4 section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)		Nonattainment		Moderate.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
San Joaquin Valley, CA:
Fresno County		Nonattainment	2/19/16	Serious.
Kern County (part)		Nonattainment	2/19/16	Serious.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings County		Nonattainment	2/19/16	Serious.
Madera County		Nonattainment	2/19/16	Serious.
Merced County		Nonattainment	2/19/16	Serious.
San Joaquin County		Nonattainment	2/19/16	Serious.
Stanislaus County		Nonattainment	2/19/16	Serious.
Tulare County		Nonattainment	2/19/16	Serious.
Yuba City-Marysville, CA
Sutter County	1/8/15	Attainment
Yuba County (part)	1/8/15	Attainment
That portion of Yuba County which lies west of the line described as follows: (Mount Diablo Base and Meridian) Beginning at the intersection of the Yuba-Nevada county line and the range line common to ranges R7E and R8E, north to the southeast corner of township T18N R7E, then west along the township line common to T17N and T18N, then north along the range line common to ranges R6E and R7E, then west along the township line common to T19N and T18N to the Yuba-Butte County boundary.
Rest of State:
North Coast Air Basin:
Del Norte County		Unclassifiable/Attainment
Humboldt County		Unclassifiable/Attainment
Mendocino County		Unclassifiable/Attainment
Sonoma County (part)		Unclassifiable/Attainment
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive, thence running along said boundary of Rancho Canada de Jonive westerly; northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly and northerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road: thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 north, Mt. Diablo Base and Meridian; thence running easterly along said Township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California.
Trinity County		Unclassifiable/Attainment
Northeast Plateau Air Basin:
Lassen County		Unclassifiable/Attainment
Modoc County		Unclassifiable/Attainment
Siskiyou County		Unclassifiable/Attainment
Lake County Air Basin:
Lake County		Unclassifiable/Attainment
Upper Sacramento Valley Region:
Butte County (remainder)		Unclassifiable/Attainment
Colusa County		Unclassifiable/Attainment
Glenn County		Unclassifiable/Attainment
Shasta County		Unclassifiable/Attainment
Tehama County		Unclassifiable/Attainment
Yuba County (remainder)		Unclassifiable/Attainment
Sacramento Metropolitan Region:
Yolo County (remainder)		Unclassifiable/Attainment
Northern Mountain Counties:
Nevada County		Unclassifiable/Attainment
Plumas County		Unclassifiable/Attainment
Sierra County		Unclassifiable/Attainment
Central Mountain Counties:
Amador County		Unclassifiable/Attainment
Calaveras County		Unclassifiable/Attainment
Southern Mountain Counties:
Mariposa County		Unclassifiable/Attainment
Tuolumne County		Unclassifiable/Attainment
Lake Tahoe Air Basin:
El Dorado County (remainder)		Unclassifiable/Attainment
Placer County (remainder)		Unclassifiable/Attainment
North Central Coast Air Basin:
Monterey County		Unclassifiable/Attainment
San Benito County		Unclassifiable/Attainment
Santa Cruz County		Unclassifiable/Attainment
San Luis Obispo County:
San Luis Obispo County		Unclassifiable/Attainment
Santa Barbara County:
Santa Barbara County (part)		Unclassifiable/Attainment
Excluding San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands
Santa Barbara County (part)		Unclassifiable/Attainment
San Miguel, Santa Rosa, Santa Cruz, and Santa Barbara Islands
Ventura County:
Ventura County (part)		Unclassifiable/Attainment
Excluding Anacapa and San Nicolas Islands.
Ventura County (part)		Unclassifiable/Attainment
Anacapa and San Nicolas Islands.
Great Basin Valleys Air Basin:
Alpine County		Unclassifiable/Attainment
Inyo County (part)		Unclassifiable/Attainment
That portion of Inyo County that Lies outside Hydrologic Unit Number 18090205.
Mono County		Unclassifiable/Attainment
Coso Junction:
Inyo County (part)		Unclassifiable/Attainment
That portion of Inyo County that lies inside Hydrologic Unit Number 18090205.
Eastern Kern County:
Kern County (part)		Unclassifiable/Attainment
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205-the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; Then northwest Along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Indian Wells Valley:
Kern County (part)		Unclassifiable/Attainment
That portion of Kern County that lies inside Hydrologic Unit Number 18090205.
Western Mojave Desert and Antelope Valley:
Los Angeles County (part)		Unclassifiable/Attainment
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
San Bernardino County (part)		Unclassifiable/Attainment
That portion of San Bernardino County (with the exception of that portion in Hydrologic Unit Number 18090205) which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; And that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Trona:
San Bernardino County (part)		Unclassifiable/Attainment
That portion of San Bernardino County that lies inside Hydrologic Unit Number 18090205.
Coachella Valley:
Riverside County (part)		Unclassifiable/Attainment
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then North along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line: And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, Elevation 45'05''; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line.
Far Eastern Riverside and San Bernardino Counties:
San Bernardino County (remainder)		Unclassifiable/Attainment
Riverside County (remainder)		Unclassifiable/Attainment
Imperial County (remainder)		Unclassifiable Attainment
San Diego County		Unclassifiable/Attainment

^a Includes Indian Country located in each county or area, except as otherwise specified.

¹ This date is 30 days after November 13, 2009, unless otherwise noted.

² This date is July 2, 2014, unless otherwise noted.

California-NO₂ (1971 Annual Standard)

Designated area	Does not meet primary standards	Cannot be classified or better than national standards
North Coast Air Basin		X
San Francisco Area Air Basin		X
Lake County Air Basin		X
North Central Coast Air Basin:
Monterey portion		X
San Benito portion		X
Santa Cruz portion		X
South Central Coast Air Basin:
San Luis Obispo Count		X
Santa Barbara AQMA		X
Santa Barbara non-AQMA		X
Ventura County		X
Channel Islands		X
San Diego Air Basin:
West San Diego County		X
East San Diego County		X
South Coast Air Basin		X
San Joaquin Valley Air Basin:
Fresno County		X
Kern County (SJVAS portion)		X
Kings County		X
Madera County		X
Merced County		X
San Joaquin County		X
Stanislaus County		X
Tulare County		X
Sacramento Valley Air Basin:
Sacramento County		X
Solano County (Sacramento Valley Air Basin portion)		X
Yolo County		X
Butte County		X
Colusa County		X
Glenn County		X
Shasta County (Sacramento Valley portion)		X
Sutter County		X
Tehama County		X
Yuba County		X
Great Basin Valleys Air Basin		X
Northeast Plateau Air Basin		X
Mountain Counties Air Basin:
AQMA portion of Placer Co. County		X
Placer County excluding AQMA portion and Lake Tahoe portion		X
Anador County		X
Calaveras County		X
El Dorado County, excluding Lake Tahoe Air Basin portion		X
Mariposa County		X
Nevada County		X
Plumas County		X
Sierra County		X
Tuolumne County		X
Southeast Desert Air Basin County:
Kern County (S.E. Desert portion) County		X
Imperial County		X
Los Angeles County (portion within S.E. Desert Air Basin)		X
Riverside County (portion not within South Coast Air Basin or Coachella Valley planning area)		X
San Bernardino County (portion within S.E. Desert AQMA)		X
Riverside County (Coachella Valley planning area)		X
San Bernardino, non-AQMA		X
Tahoe Air Basin		X

California-NO₂ (2010 1-Hour Standard)

Designated area	Designation^a
Designated area	Date¹	Type
Amador County APCD:
Amador County		Unclassifiable/Attainment.
Antelope Valley AQMD:
Los Angeles County (part)		Unclassifiable/Attainment.
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T. 3 N and T. 2 N, San Bernardino Base and Meridian; then north along the range line common to R. 8 W and R. 9 W; then west along the township line common to T. 4 N and T. 3 N; then north along the range Line Common to R. 12 W and R. 13 W to the southeast corner of Section 12, T. 5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T. 5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T. 7 N and T. 6 N (point is at the northwest corner of Section 4 in T. 6 N, R. 14 W); then west along the township line common to T. 7 N and T. 6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T. 7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T. 7 N, R. 16 W; then north along the range line common to R. 16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T. 8 N and T. 7 N) then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Bay Area AQMD:
Alameda County		Unclassifiable/Attainment.
Contra Costa County		Unclassifiable/Attainment.
Marin County		Unclassifiable/Attainment.
Napa County		Unclassifiable/Attainment.
San Francisco County		Unclassifiable/Attainment.
San Mateo County		Unclassifiable/Attainment.
Santa Clara County		Unclassifiable/Attainment.
Solano County (part)		Unclassifiable/Attainment.
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34, T. 6 N, R. 2.W, Mount Diablo Base and Meridian, thence east along said ¹/₄ section line to the east boundary of Section 36, T. 6 N, R. 2 W, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N, R. 1 W, thence east along a line common to T. 5 N and T. 6 N to the northeast corner of Section 3, T. 5 N, R. 1 E, thence south along section lines to the southeast corner of Section 10, T. 3 N, R. 1 E, thence east along section lines to the south ¹/₄ corner of Section 8, T. 3 N, R. 2 E, thence east to the boundary between Solano and Sacramento Counties
Sonoma County (part)		Unclassifiable/Attainment.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Meridian; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties
Butte County AQMD:
Butte County		Unclassifiable/Attainment.
Calaveras County AQMD:
Calaveras County		Unclassifiable/Attainment.
Colusa County AQMD:
Colusa County		Unclassifiable/Attainment.
Eastern Kern APCD:
Kern County (part)		Unclassifiable/Attainment.
That portion of Kern County east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W and R. 17 W, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, T. 11 N, R. 17 W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, T. 32 S, R. 30 E, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, T. 31 S, R. 30 E; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, T. 31 S, R. 31 E; then east to the southeast corner of Section 13, T. 31 S, R. 31 E; then north along the range line common to R. 31 E and R. 32 E, Mount Diablo Base and Meridian, to the northwest corner of Section 6, T. 29 S, R. 32 E; then east to the southwest corner of Section 31 T. 28 S, R. 32 E; then north along the range line common to R. 31 E and R. 32 E to the northwest corner of Section 6, T. 28 S, R. 32 E, then west to the southeast corner of Section 36, T. 27 S, R. 31 E, then north along the range line common to R. 31 E and R. 32 E to the Kern-Tulare County boundary
El Dorado County AQMD:
El Dorado County		Unclassifiable/Attainment.
Feather River AQMD:
Sutter County		Unclassifiable/Attainment.
Yuba County		Unclassifiable/Attainment.
Glenn County APCD:
Glenn County		Unclassifiable/Attainment.
Great Basin Unified APCD:
Alpine County		Unclassifiable/Attainment.
Inyo County		Unclassifiable/Attainment.
Mono County		Unclassifiable/Attainment.
Imperial County APCD:
Imperial County		Unclassifiable/Attainment.
Lake County AQMD:
Lake County		Unclassifiable/Attainment.
Lassen County APCD:
Lassen County		Unclassifiable/Attainment.
Mariposa County APCD:
Mariposa County		Unclassifiable/Attainment.
Mendocino County AQMD:
Mendocino County		Unclassifiable/Attainment.
Modoc County APCD:
Modoc County		Unclassifiable/Attainment.
Mojave Desert AQMD:
Riverside County (part)		Unclassifiable/Attainment.
That portion of Riverside County which lies east of a line described as follows: Beginning at the southwest corner of Section 32, T. 8 S, R. 20 E, San Bernardino Base and Meridian, on the Riverside-Imperial County Boundary; then northerly along section lines to the northwest corner of Section 5, T. 7 S, R. 20 E; then westerly along the township line to the southwest corner of Section 31, T. 6 S, R. 19 E; then northerly along the range line to the northwest corner of Section 6, T. 5 S, R. 19 E; then easterly along the township line to the southwest corner of Section 33, T. 4 S, R. 19 E; then northerly along section lines to the northwest corner of Section 4, T. 4 S, R. 19 E; then westerly along the township lines to the southwest corner of Section 32, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 17, T. 3 S, R. 19 E; then westerly along the township line to the southwest corner of Section 7, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 30, T. 2 S, R. 19 E; then westerly along the southerly line of Section 24, T. 2 S, R. 18 E, to the southwest corner thereof; then northerly along section lines to the northwest corner of Section 13, T. 2 S, R. 18 E; then westerly along section lines to the southwest corner of Section 10, T. 2 S, R. 18 E; then northerly along section lines to the Riverside-San Bernardino County boundary
San Bernardino County (part)		Unclassifiable/Attainment.
That portion of San Bernardino County east and north of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E, San Bernardino Base and Meridian; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary
Monterey Bay Unified APCD:
Monterey County		Unclassifiable/Attainment.
San Benito County		Unclassifiable/Attainment.
Santa Cruz County		Unclassifiable/Attainment.
North Coast Unified AQMD:
Del Norte County		Unclassifiable/Attainment.
Humboldt Count		Unclassifiable/Attainment.
Trinity County		Unclassifiable/Attainment.
Northern Sierra AQMD:
Nevada County		Unclassifiable/Attainment.
Plumas County		Unclassifiable/Attainment.
Sierra County		Unclassifiable/Attainment.
Northern Sonoma County APCD:
Sonoma County (part)		Unclassifiable/Attainment.
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, Mount Diablo Meridian; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
Placer County APCD:
Placer County		Unclassifiable/Attainment.
Sacramento Metropolitan AQMD:
Sacramento County		Unclassifiable/Attainment.
San Diego County APCD:
San Diego County		Unclassifiable/Attainment.
San Joaquin Valley Unified APCD:
Fresno County		Unclassifiable/Attainment.
Kern County (part)		Unclassifiable/Attainment.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W and R. 17 W, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of Section 3, T. 11 N, R. 17 W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, T. 32 S, R. 30 E, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, T. 31 S, R. 30 E; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, T. 31 S, R. 31 E; then east to the southeast corner of Section 13, T. 31 S, R. 31 E; then north along the range line common to R. 31 E and R. 32 E, Mount Diablo Base and Meridian, to the northwest corner of Section 6, T. 29 S, R. 32 E; then east to the southwest corner of Section 31, T. 28 S, R. 32 E; then north along the range line common to R. 31 E and R. 32 E to the northwest corner of Section 6, T. 28 S, R. 32 E, then west to the southeast corner of Section 36, T. 27 S, R. 31 E, then north along the range line common to R. 31 E and R. 32 E to the Kern-Tulare County boundary.
Kings County		Unclassifiable/Attainment.
Madera County		Unclassifiable/Attainment.
Merced County		Unclassifiable/Attainment.
San Joaquin County		Unclassifiable/Attainment.
Stanislaus County		Unclassifiable/Attainment.
Tulare County		Unclassifiable/Attainment.
San Luis Obispo County APCD:
San Luis Obispo County		Unclassifiable/Attainment.
Santa Barbara County APCD:
Santa Barbara County		Unclassifiable/Attainment.
Shasta County AQMD:
Shasta County		Unclassifiable/Attainment.
Siskiyou County APCD:
Siskiyou County		Unclassifiable/Attainment.
South Coast AQMD:
Los Angeles County (part)		Unclassifiable/Attainment.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T.3 N and T.2 N, San Bernardino Base and Meridian; then north along the range line common to R.8 W and R.9 W; then west along the township line common to T.4 N and T.3 N; then north along the range line common to R.12 W and R.13 W to the southeast corner of Section 12, T.5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T.5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T.7 N and T. 6 N (point is at the northwest corner of Section 4 in T.6 N, R. 14 W); then west along the township line common to T.7 N and T.6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T.7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T.7 N, R. 16 W; then north along the range line common to R.16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T.8 N and T.7 N); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County		Unclassifiable/Attainment.
Riverside County (part)		Unclassifiable/Attainment.
That portion of Riverside County which lies west of a line described as follows: Beginning at the southwest corner of Section 32, T. 8 S, R. 20 E, San Bernardino Base and Meridian, on the Riverside-Imperial County Boundary; then northerly along section lines to the northwest corner of Section 5, T. 7 S, R. 20 E; then westerly along the township line to the southwest corner of Section 31, T. 6 S, R. 19 E; then northerly along the range line to the northwest corner of Section 6, T. 5 S, R. 19 E; then easterly along the township line to the southwest corner of Section 33, T. 4 S, R. 19 E; then northerly along section lines to the northwest corner of Section 4, T. 4 S, R. 19 E; then westerly along the township lines to the southwest corner of Section 32, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 17, T. 3 S, R. 19 E; then westerly along the township line to the southwest corner of Section 7, T. 3 S, R. 19 E; then northerly along section lines to the northwest corner of Section 30, T. 2 S, R. 19 E; then westerly along the southerly line of Section 24, T. 2 S, R. 18 E, to the southwest corner thereof; then northerly along section lines to the northwest corner of Section 13, T. 2 S, R. 18 E; then westerly along section lines to the southwest corner of Section 10, T. 2 S, R. 18 E; then northerly along section lines to the Riverside-San Bernardino County boundary.
San Bernardino County (part)		Unclassifiable/Attainment.
That portion of San Bernardino County west and south of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary.
Tehama County APCD:
Tehama County		Unclassifiable/Attainment.
Tuolumne County APCD:
Tuolumne County		Unclassifiable/Attainment.
Ventura County APCD:
Ventura County		Unclassifiable/Attainment.
Yolo-Solano AQMD:
Solano County		Unclassifiable/Attainment.
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34, T. 6 N, R. 2 W, Mount Diablo Base and Meridian, thence east along said ¹/₄ section line to the east boundary of Section 36, T. 6 N, R. 2 W, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T. 5 N, R. 1 W, thence east along a line common to T. 5 N and T. 6 N to the northeast corner of Section 3, T. 5 N, R. 1 E, thence south along section lines to the southeast corner of Section 10, T. 3 N, R. 1 E, thence east along section lines to the south ¹/₄ corner of Section 8, T. 3 N, R. 2 E, thence east to the boundary between Solano and Sacramento Counties.
Yolo County		Unclassifiable/Attainment.

^a Includes Indian Country located in each county or area, except as otherwise specified.

¹ This date is 90 days after October 31, 2011, unless otherwise noted.

California-1997 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area	Designation^a		Category/classification
Designated area	Date¹	Type	Date¹	Type
Amador and Calaveras Cos., CA:
(Central Mountain Cos.)
Amador County		Nonattainment	6/13/12	Subpart 2/Moderate.
Calaveras County		Nonattainment	6/13/12	Subpart 2/Moderate.
Chico, CA:
Butte County		Nonattainment	6/13/12	Subpart 2/Marginal.
Kern County (Eastern Kern), CA
Kern County (part)		Nonattainment	6/13/12	Subpart 2/Moderate.
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205-the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary
Imperial County, CA: Imperial County		Nonattainment	3/14/08	Subpart 2/Moderate.
Los Angeles-South Coast Air Basin, CA:^d^f		Nonattainment	(²)	Subpart 2/Extreme.
Los Angeles County (part)		Nonattainment	(²)	Subpart 2/Extreme.
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County		Nonattainment	(²)	Subpart 2/Extreme.
Riverside County (part)		Nonattainment	(²)	Subpart 2/Extreme.
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line
San Bernardino County (part)		Nonattainment	(²)	Subpart 2/Extreme.
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary
Pechanga Reservation^c	April 3, 2015	Attainment.
Morongo Band of Mission Indians^e		Nonattainment		Subpart 2/Severe-17.
Los Angeles and San Bernardino Counties (Western Mojave Desert), CA		Nonattainment	6/7/2012	Subpart 2/Severe-15.
Los Angeles County (part)		Nonattainment	6/7/2012	Subpart 2/Severe-15.
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
San Bernardino County (part)		Nonattainment	6/7/2012	Subpart 2/Severe-15.
That portion of San Bernardino County which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; And that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Mariposa and Tuolumne Cos., CA: (Southern Mountain Counties)
Mariposa County		Nonattainment	6/13/12	Subpart 2/Moderate.
Tuolumne County		Nonattainment	6/13/12	Subpart 2/Moderate.
Riverside Co. (Coachella Valley), CA:
Riverside County (part)^g		Nonattainment	6/12/19	Subpart 2/Extreme.
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line. And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to Range 17 East and Range 16 East, San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through Township 8 South, Range 16 East and Township 7 South, Range 16 East, until the Black Butte Mountain, elevation 4504'; then west and northwest along the ridge line to the southwest corner of Township 5 South, Range 14 East; then north along the range line common to Range 14 East and Range 13 East; then west and northwest along the ridge line to Monument Mountain, elevation 4834'; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814'; then northwest along the ridge line to the Riverside-San Bernardino County line.
Agua Caliente Band of Cahuilla Indians of the Agua Caliente Indian Reservation^e		Nonattainment	(²)	Subpart 2/Severe-15.
Augustine Band of Cahuilla Indians^e		Nonattainment	(²)	Subpart 2/Severe-15.
Cabazon Band of Mission Indians^e		Nonattainment	(²)	Subpart 2/Severe-15.
Santa Rosa Band of Cahuilla Indians^e		Nonattainment	(²)	Subpart 2/Severe-15.
Torres Martinez Desert Cahuilla Indians^e		Nonattainment	(²)	Subpart 2/Severe-15.
Twenty-Nine Palms Band of Mission Indians of California^e		Nonattainment	(²)	Subpart 2/Severe-15.
Sacramento Metro, CA		Nonattainment	(²)	Subpart 2/Severe-15.
El Dorado County (part)		Nonattainment	(²)	Subpart 2/Severe-15.
All portions of the county, except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part)		Nonattainment	(²)	Subpart 2/Severe-15.
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.
Sacramento County		Nonattainment	(²)	Subpart 2/Severe-15.
Solano County (part)		Nonattainment	(²)	Subpart 2/Severe-15.
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said ¹/₄ section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south ¹/₄ corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Sutter County (part)		Nonattainment	(²)	Subpart 2/Severe-15.
Portion south of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County
Yolo County		Nonattainment	(²)	Subpart 2/Severe-15.
San Diego, CA
San Diego County (part)^f
That portion of San Diego County that excludes the areas listed below: La Posta Areas #1 and #2,^b Cuyapaipe Area,^b Manzanita Area,^b Campo Areas #1 and #2^b	July 5, 2013	Attainment.
La Posta Areas #1 and #2^b		Unclassifiable/Attainment.
Cuyapaipe Area^b		Unclassifiable/Attainment.
Manzanita Area^b		Unclassifiable/Attainment.
Campo Areas #1 and #2^b		Unclassifiable/Attainment.
San Francisco Bay Area, CA		Nonattainment		Subpart 2/Marginal.
Alameda County		Nonattainment		Subpart 2/Marginal.
Contra Costa County		Nonattainment		Subpart 2/Marginal.
Marin County		Nonattainment		Subpart 2/Marginal.
Napa County		Nonattainment		Subpart 2/Marginal.
San Francisco County		Nonattainment		Subpart 2/Marginal.
San Mateo County		Nonattainment		Subpart 2/Marginal.
Santa Clara County		Nonattainment		Subpart 2/Marginal.
Solano County (part)		Nonattainment		Subpart 2/Marginal.
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said ¹/₄ section line to the east boundary of Section 36, T6N, R2W, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south ¹/₄ corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)		Nonattainment		Subpart 2/Marginal.
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
San Joaquin Valley, CA		Nonattainment	(²)	Subpart 2/Extreme.
Fresno County		Nonattainment	(²)	Subpart 2/Extreme.
Kern County (part)		Nonattainment	(²)	Subpart 2/Extreme.
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary.
Kings County		Nonattainment	(²)	Subpart 2/Extreme.
Madera County		Nonattainment	(²)	Subpart 2/Extreme.
Merced County		Nonattainment	(²)	Subpart 2/Extreme.
San Joaquin County		Nonattainment	(²)	Subpart 2/Extreme.
Stanislaus County		Nonattainment	(²)	Subpart 2/Extreme.
Tulare County		Nonattainment	(²)	Subpart 2/Extreme.
Sutter County (part), CA:
Sutter County (part)
(Sutter Buttes) That portion of the Sutter Buttes mountain range at or above 2,000 feet in elevation		Nonattainment	6/13/12	Subpart 2/Marginal.
Remainder of County		Unclassifiable/Attainment
Ventura County, CA:
Ventura County (part)-That part of Ventura County excluding the Channel Islands of Anacapa and San Nicolas Islands.		Nonattainment	6/19/08	Subpart 2/Serious.
Remainder of County		Unclassifiable/Attainment
Nevada County (Western part), CA Nevada County (part)
That portion of Nevada County, which lies west of a line, described as follows: beginning at the Nevada-Placer County boundary and running north along the western boundaries of Sections 24, 13, 12, 1, Township 17 North, Range 14 East, Mount Diablo Base and Meridian, and Sections 36, 25, 24, 13, 12, Township 18 North, Range 14 East to the Nevada-Sierra County boundary		Nonattainment	6/13/12	Subpart 2/Moderate.
Santa Barbara-Santa Maria-Lompoc, CA:
Santa Barbara County		Unclassifiable/Attainment
Mohave Desert Air Basin:
Riverside County (part) remainder		Unclassifiable/Attainment
San Bernardino County (part) remainder		Unclassifiable/Attainment
Great Basin Valleys Air Basin		Unclassifiable/Attainment
Alpine County
Inyo County
Mono County
Lake County Air Basin		Unclassifiable/Attainment
Lake County
Lake Tahoe Air Basin		Unclassifiable/Attainment
El Dorado County (part)
Lake Tahoe Area: As described under 40 CFR 81.275 .
Placer County (part)
Lake Tahoe Area: As described under 40 CFR 81.275 .
Monterey Bay Area		Unclassifiable/Attainment
Monterey County
San Benito County
Santa Cruz County
Mountain Counties Air Basin (remainder of):
Nevada County (part) remainder		Unclassifiable/Attainment
Plumas County		Unclassifiable/Attainment
Sierra County		Unclassifiable/Attainment
North Coast Air Basin		Unclassifiable/Attainment
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part) remainder
Trinity County
Northeast Plateau Air Basin		Unclassifiable/Attainment
Lassen County
Modoc County
Siskiyou County
Sacramento Valley Air Basin (remainder of):
Colusa County		Unclassifiable/Attainment
Glenn County		Unclassifiable/Attainment
Shasta County		Unclassifiable/Attainment
Tehama County		Unclassifiable/Attainment
Yuba County		Unclassifiable/Attainment
South Central Coast Air Basin:
(remainder of)
Channel Islands		Unclassifiable/Attainment
San Luis Obispo County		Unclassifiable/Attainment

^a Includes Indian Country located in each county or area, except as otherwise specified.

^b The boundaries for these designated areas are based on coordinates of latitude and longitude derived from EPA Region 9's GIS database and are illustrated in a map entitled "Eastern San Diego County Attainment Areas for the 8-Hour Ozone NAAQS," dated March 9, 2004, including an attached set of coordinates. The map and attached set of coordinates are available at EPA's Region 9 Air Division office. The designated areas roughly approximate the boundaries of the reservations for these tribes, but their inclusion in this table is intended for CAA planning purposes only and is not intended to be a federal determination of the exact boundaries of the reservations. Also, the specific listing of these tribes in this table does not confer, deny, or withdraw Federal recognition of any of the tribes so listed nor any of the tribes not listed.

^c The use of reservation boundaries for this designation is for purposes of CAA planning only and is not intended to be a federal determination of the exact boundaries of the reservations. Nor does the specific listing of the Tribes in this table confer, deny, or withdraw Federal recognition of any of the Tribes listed or not listed.

^d Excludes Morongo Band of Mission Indians' Indian country in Riverside County.

^e Includes Indian country of the tribe listed in this table. Information pertaining to areas of Indian country in this table is intended for CAA planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.

^f Excludes the Pechanga Reservation.

^g Excludes Indian country of the Agua Caliente Band of Cahuilla Indians, the Augustine Band of Cahuilla Mission Indians, the Cabazon Band of Mission Indians, the Santa Rosa Band of Cahuilla Indians, the Torres Martinez Desert Cahuilla Indians, and the Twenty-Nine Palms Band of Mission Indians in Riverside County.

¹ This date is June 15, 2004, unless otherwise noted.

² This date is June 4, 2010.

California-2008 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area	Designation		Classification
Designated area	Date¹	Type	Date¹	Type
Calaveras County, CA:² Calaveras County		Nonattainment		Marginal.
Chico (Butte County), CA:²		Nonattainment		Marginal.
Butte County
Berry Creek Rancheria of Maidu Indians of California³
Enterprise Rancheria of Maidu Indians of California³
Mechoopda Indian Tribe of Chico Rancheria³
Mooretown Rancheria of Maidu Indians of California³
Imperial County, CA:²		Nonattainment	6/3/16	Moderate.
Imperial County
Quechan Tribe of the Fort Yuma Indian Reservation³
Torres Martinez Desert Cahuilla Indians³
Kern County (Eastern Kern), CA:²		Nonattainment	July 7, 2021	Severe-15.
Kern County (part):
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205-the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Los Angeles-San Bernardino Counties (West Mojave Desert), CA:²		Nonattainment		Severe 15.
Los Angeles County (part)
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
San Bernardino County (part)
That portion of San Bernardino County which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; and that portion of San Bernardino County which lies south and west of a line described as follows: latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west
Twenty-Nine Palms Band of Mission Indians of California³
Los Angeles-South Coast Air Basin, CA²		Nonattainment		Extreme.
Los Angeles County (part)
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County
Riverside County (part)
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the southern boundaries of Sections 25, 26, and 27, Township 7 South, Range 4 East, then North along the west boundaries of Sections 27, 22, 15, 10, and 3 Township 7 South, Range 4 East, then East along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line.
San Bernardino County (part)
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Cahuilla Band of Mission Indians of the Cahuilla Reservation³
Ramona Band of Cahuilla³
San Manuel Band of Mission Indians³
Soboba Band of Luiseno Indians³
Mariposa County, CA:² Mariposa County		Nonattainment	6/3/16	Moderate.
Nevada County (Western part), CA:²		Nonattainment	9/23/2019	Serious.
Nevada County (part):
That portion of Nevada County, which lies west of a line, described as follows: Beginning at the Nevada-Placer County boundary and running north along the western boundaries of Sections 24, 13, 12, 1, Township 17 North, Range 14 East, Mount Diablo Base and Meridian, and Sections 36, 25, 24, 13, 12, Township 18 North, Range 14 East to the Nevada-Sierra County boundary
Riverside County (Coachella Valley), CA:²
Riverside County (part)		Nonattainment	4/7/2023	Extreme.
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line. And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of hydrologic Unit Number 18100100 within Riverside County.
Agua Caliente Band of Cahuilla Indians of the Agua Caliente Indian Reservation³		Nonattainment		Severe-15.
Augustine Band of Cahuilla Indians³		Nonattainment		Severe-15.
Cabazon Band of Cahuilla Indians³		Nonattainment		Severe-15. 8
Santa Rosa Band of Cahuilla Indians³		Nonattainment		Severe-15.
Torres Martinez Desert Cahuilla Indians³		Nonattainment		Severe-15.
Twenty-Nine Palms Band of Mission Indians of California³		Nonattainment		Severe-15.
Sacramento Metro, CA:²		Nonattainment		Severe 15.
El Dorado County (part)
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part)
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.
Sacramento County
Solano County (part)
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said ¹/₄ section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south ¹/₄ corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Sutter County (part)
Portion south of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County.
Yolo County
Shingle Springs Band of Miwok Indians, Shingle Springs Rancheria (Verona Tract)³
United Auburn Indian Community of the Auburn Rancheria of California³
Yocha Dehe Wintun Nation³
San Diego County, CA		Nonattainment	July 2, 2021	Severe-15.
San Diego County:
Barona Group of Capitan Grande Band of Mission Indians of the Barona Reservation. ³
Campo Band of Diegueno Mission Indians of the Campo Indian Reservation. ³
Capitan Grande Band of Diegueno Mission Indians of California. ³
Ewiiaapaayp Band of Kumeyaay Indians. ³
Iipay Nation of Santa Ysabel. ³
Inaja Band of Diegueno Mission Indians of the Inaja and Cosmit Reservation. ³
Jamul Indian Village of California. ³
La Jolla Band of Luiseno Indians. ³
La Posta Band of Diegueno Mission Indians of the La Posta Indian Reservation. ³
Los Coyotes Band of Cahuilla and Cupeno Indians. ³
Manzanita Band of Diegueno Mission Indians of the Manzanita Reservation. ³
Mesa Grande Band of Diegueno Mission Indians of the Mesa Grande Reservation. ³
Pala Band of Luiseno Mission Indians of the Pala Reservation. ³
Pauma Band of Luiseno Mission Indians of the Pauma and Yuima Reservation. ³
Rincon Band of Luiseno Mission Indians of the Rincon Reservation. ³
San Pasqual Band of Diegueno Mission Indians of California. ³
Sycuan Band of the Kumeyaay Nation. ³
Viejas (Baron Long) Group of Capitan Grande Band of Mission Indians. ³
San Francisco Bay Area, CA:²		Nonattainment		Marginal.
Alameda County
Contra Costa County
Marin County
Napa County
San Francisco County
San Mateo County
Santa Clara County
Solano County (part)
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said ¹/₄ section line to the east boundary of Section 36, T6N, R2W, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south ¹/₄ corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part)
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence Running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
Federated Indians of Graton Rancheria³
Lytton Rancheria of California³
San Joaquin Valley, CA:²		Nonattainment		Extreme.
Fresno County
Kern County (part)
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary.
Kings County
Madera County
Merced County
San Joaquin County
Stanislaus County
Tulare County
Big Sandy Rancheria of Mono Indians of California³
Cold Springs Rancheria of Mono Indians of California³
Northfork Rancheria of Mono Indians of California³
Picayune Rancheria of Chukchansi Indians of California³
Santa Rosa Indian Community of the Santa Rosa Rancheria³
Table Mountain Rancheria of California³
Tule River Indian Tribe of the Tule River Reservation³
San Luis Obispo (Eastern San Luis Obispo), CA:²		Nonattainment	6/3/16	Marginal.⁵
San Luis Obispo County (part)
That portion of San Luis Obispo County that lies east of a line described as follows: Beginning at the San Luis Obispo County/Santa Barbara County boundary and running north along 120 degrees 24 minutes longitude to the intersection with 35 degrees 27 minutes latitude; east along 35 degrees 27 minutes latitude to the intersection with 120 degrees 18 minutes longitude; then north along 120 degrees 18 minutes longitude to the San Luis Obispo County/Monterey County boundary
Tuscan Buttes, CA:²		Nonattainment		Marginal.
Tehama County (part)
Those portions of the immediate Tuscan Buttes area at or above 1,800 feet in elevation.
Ventura County, CA:²		Nonattainment		Serious.
Ventura County (part)
That part of Ventura County excluding the Channel Islands of Anacapa and San Nicolas Islands.
Morongo Band of Mission Indians³		Nonattainment	11/7/22	Severe.
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation³		Nonattainment		Moderate.
Rest of State:⁴
Alpine, Inyo, and Mono Counties:		Unclassifiable/Attainment
Alpine County
Inyo County
Mono County
Amador County		Unclassifiable/Attainment
Channel Islands (Ventura County)		Unclassifiable/Attainment
Ventura County (part) remainder
Colusa County		Unclassifiable/Attainment
Del Norte, Humboldt, and Trinity Counties):		Unclassifiable/Attainment
Del Norte County
Humboldt County
Trinity County
Nevada County (part) remainder		Unclassifiable/Attainment
Glenn County		Unclassifiable/Attainment
Kern County (part) remainder		Unclassifiable/Attainment
Lake County		Unclassifiable/Attainment
Lake Tahoe (El Dorado County Portion):		Unclassifiable/Attainment
El Dorado County (part) remainder
Lake Tahoe (Placer County Portion):		Unclassifiable/Attainment
Placer County (part) remainder
Lassen County		Unclassifiable/Attainment
Mendocino County		Unclassifiable/Attainment
Modoc County		Unclassifiable/Attainment
Monterey County		Unclassifiable/Attainment
Northeastern San Bernardino County and Eastern Riverside County		Unclassifiable/Attainment
San Bernardino County (part) remainder
Riverside County (part) remainder
Sonoma County (part) remainder		Unclassifiable/Attainment
Sutter County and Yuba County		Unclassifiable/Attainment
Sutter County (part) remainder
Yuba County
Plumas and Sierra Counties		Unclassifiable/Attainment
San Benito County		Unclassifiable/Attainment
Santa Barbara County		Unclassifiable/Attainment
Santa Cruz County		Unclassifiable/Attainment
Shasta County		Unclassifiable/Attainment
Siskiyou County		Unclassifiable/Attainment
Tehama County (part) remainder		Unclassifiable/Attainment
Tuolumne County		Unclassifiable/Attainment
San Luis Obispo County (part) remainder		Unclassifiable/Attainment

¹ This date is July 20, 2012, unless otherwise noted.

² Excludes Indian country located in each area, unless otherwise noted.

³ Includes Indian country of the tribe listed in this table located in the identified area. Information pertaining to areas of Indian country in this table is intended for CAA planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.

⁴ Includes any Indian country in each county or area, unless otherwise specified.

California-2015 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area¹	Designation		Classification
Designated area¹	Date²	Type	Date²	Type
Amador County, CA		Nonattainment		Marginal.
Amador County:
Buena Vista Rancheria of Me-Wuk Indians of California.
Jackson Band of Miwuk Indians.
Butte County, CA		Nonattainment		Marginal.
Butte County:
Berry Creek Rancheria of Maidu Indians of California.
Enterprise Rancheria of Maidu Indians of California.
Mechoopda Indian Tribe of Chico Rancheria.
Mooretown Rancheria of Maidu Indians of California.
Calaveras County, CA		Nonattainment		Marginal.
Calaveras County:
California Valley Miwok Tribe.
Imperial County, CA		Nonattainment		Marginal.
Imperial County:
Quechan Tribe of the Fort Yuma Indian Reservation.
Torres Martinez Desert Cahuilla Indians.
Kern County (Eastern Kern), CA		Nonattainment	11/29/21	Serious.
Kern County (part):
That portion of Kern County (with the exception of that portion in Hydrologic Unit Number 18090205-the Indian Wells Valley) east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Liebre Land Grant to the point of intersection with the range line common to Range 16 West and Range 17 West, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Grant to the northwest corner of Section 3, Township 11 North, Range 17 West; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of Section 34, Township 32 South, Range 30 East, Mount Diablo Base and Meridian; then north to the northwest corner of Section 35, Township 31 South, Range 30 East; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of Section 18, Township 31 South, Range 31 East; then east to the southeast corner of Section 13, Township 31 South, Range 31 East; then north along the range line common to Range 31 East and Range 32 East, Mount Diablo Base and Meridian, to the northwest corner of Section 6, Township 29 South, Range 32 East; then east to the southwest corner of Section 31, Township 28 South, Range 32 East; then north along the range line common to Range 31 East and Range 32 East to the northwest corner of Section 6, Township 28 South, Range 32 East, then west to the southeast corner of Section 36, Township 27 South, Range 31 East, then north along the range line common to Range 31 East and Range 32 East to the Kern-Tulare County boundary.
Los Angeles-San Bernardino Counties (West Mojave Desert), CA		Nonattainment		Severe-15.
Los Angeles County (part):
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
San Bernardino County (part):
That portion of San Bernardino County which lies north and east of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary; and that portion of San Bernardino County which lies south and west of a line described as follows: Latitude 35 degrees, 10 minutes north and longitude 115 degrees, 45 minutes west.
Twenty-Nine Palms Band of Mission Indians of California.
Los Angeles-South Coast Air Basin, CA		Nonattainment		Extreme.
Los Angeles County (part):
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North San Bernardino Base and Meridian; then north along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with the Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Orange County.
Riverside County (part):
That portion of Riverside County which lies to the west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the southern boundaries of Sections 25, 26, and 27, Township 7 South, Range 4 East, then North along the west boundaries of Sections 27, 22, 15, 10, and 3 Township 7 South, Range 4 East, then East along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line.
San Bernardino County (part):
That portion of San Bernardino County which lies south and west of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to Range 3 East and Range 2 East, San Bernardino Base and Meridian; then west along the Township line common to Township 3 North and Township 2 North to the San Bernardino-Los Angeles County boundary.
Cahuilla Band of Indians.
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation:
Includes only non-contiguous tribal lands known as the Meadowbrook parcel.³
Ramona Band of Cahuilla.
San Manuel Band of Mission Indians.
Soboba Band of Luiseno Indians.
Mariposa County, CA		Nonattainment	11/7/22	Moderate.
Mariposa County.
Nevada County (Western part), CA		Nonattainment	11/29/21	Serious.
Nevada County (part):
That portion of Nevada County, which lies west of a line, described as follows: Beginning at the Nevada-Placer County boundary and running north along the western boundaries of Sections 24, 13, 12, 1, Township 17 North, Range 14 East, Mount Diablo Base and Meridian, and Sections 36, 25, 24, 13, 12, Township 18 North, Range 14 East to the Nevada-Sierra County boundary.
Riverside County (Coachella Valley), CA		Nonattainment		Severe-15.
Riverside County (part):
That portion of Riverside County which lies to the east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to Range 4 East and Range 3 East, San Bernardino Base and Meridian; then east along the Township line common to Township 8 South and Township 7 South; then north along the range line common to Range 5 East and Range 4 East; then west along the Township line common to Township 6 South and Township 7 South to the southwest corner of Section 34, Township 6 South, Range 4 East; then north along the west boundaries of Sections 34, 27, 22, 15, 10, and 3, Township 6 South, Range 4 East; then west along the Township line common to Township 5 South and Township 6 South; then north along the range line common to Range 4 East and Range 3 East; then west along the south boundaries of Sections 13, 14, 15, 16, 17, and 18, Township 5 South, Range 3 East; then north along the range line common to Range 2 East and Range 3 East; to the Riverside-San Bernardino County line. And that portion of Riverside County which lies to the west of a line described as follows: That segment of the southwestern boundary line of hydrologic Unit Number 18100100 within Riverside County.
Agua Caliente Band of Cahuilla Indians of the Agua Caliente Indian Reservation.
Augustine Band of Cahuilla Indians.
Cabazon Band of Mission Indians.
Santa Rosa Band of Cahuilla Indians.
Torres Martinez Desert Cahuilla Indians.
Twenty-Nine Palms Band of Mission Indians of California.
Sacramento Metro, CA		Nonattainment	11/29/21	Serious.
El Dorado County (part):
All portions of the county except that portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake.
Placer County (part):
All portions of the county except that portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, Mount Diablo Base and Meridian, and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East Mount Diablo Base and Meridian, thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, Mount Diablo Base and Meridian, to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning.
Sacramento County.
Solano County (part):
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34; Township 6 North, Range 2 West, Mount Diablo Base and Meridian, thence east along said ¹/₄ section line to the east boundary of Section 36, Township 6 North, Range 2 West, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, Township 5 North, Range 1 West, thence east along a line common to Township 5 North and Township 6 North to the northeast corner of Section 3, Township 5 North, Range 1 East, thence south along section lines to the southeast corner of Section 10, Township 3 North, Range 1 East, thence east along section lines to the south ¹/₄ corner of Section 8, Township 3 North, Range 2 East, thence east to the boundary between Solano and Sacramento Counties.
Sutter County (part):
Portion south of a line connecting the northern border of Yolo County to the SW tip of Yuba County and continuing along the southern Yuba County border to Placer County.
Yolo County:
Shingle Springs Band of Miwok Indians, Shingle Springs Rancheria.
United Auburn Indian Community of the Auburn Rancheria of California.
Wilton Rancheria.
Yocha Dehe Wintun Nation.
San Diego County, CA ²		Nonattainment	July 2, 2021	Severe-15.
San Diego County: ²
Barona Group of Capitan Grande Band of Mission Indians of the Barona Reservation.
Campo Band of Diegueno Mission Indians of the Campo Indian Reservation.
Capitan Grande Band of Diegueno Mission Indians of California.
Ewiiaapaayp Band of Kumeyaay Indians.
Iipay Nation of Santa Ysabel.
Inaja Band of Diegueno Mission Indians of the Inaja and Cosmit Reservation.
Jamul Indian Village of California.
La Jolla Band of Luiseno Indians.
La Posta Band of Diegueno Mission Indians of the La Posta Indian Reservation.
Los Coyotes Band of Cahuilla and Cupeno Indians.
Manzanita Band of Diegueno Mission Indians of the Manzanita Reservation.
Mesa Grande Band of Diegueno Mission Indians of the Mesa Grande Reservation.
Pala Band of Luiseno Mission Indians of the Pala Reservation.
Pauma Band of Luiseno Mission Indians of the Pauma and Yuima Reservation.
Rincon Band of Luiseno Mission Indians of the Rincon Reservation.
San Pasqual Band of Diegueno Mission Indians of California.
Sycuan Band of the Kumeyaay Nation.
Viejas (Baron Long) Group of Capitan Grande Band of Mission Indians.
San Francisco Bay Area, CA		Nonattainment		Marginal.
Alameda County.
Contra Costa County.
Marin County.
Napa County.
San Francisco County.
San Mateo County.
Santa Clara County.
Solano County (part):
Portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the ¹/₄ section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said ¹/₄ section line to the east boundary of Section 36, T6N, R2W, thence south ¹/₂ mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south ¹/₄ corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties.
Sonoma County (part):
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence Running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties.
Federated Indians of Graton Rancheria.
Lytton Rancheria of California.
San Joaquin Valley, CA		Nonattainment		Extreme.
Fresno County.
Kern County (part):
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W and R. 17 W, San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S 3, T. 11 N, R. 17 W; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S 34, T. 32 S, R. 30 E, Mount Diablo Base and Meridian; then north to the northwest corner of S 35, T. 31 S, R. 30 E; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S 18, T. 31 S, R. 31 E; then east to the southeast corner of S 13, T. 31 S, R. 31 E; then north along the range line common to R. 31 E and R. 32 E, Mount Diablo Base and Meridian, to the northwest corner of S 6, T. 29 S, R. 32 E; then east to the southwest corner of S 31, T. 28 S, R. 32 E; then north along the range line common to R. 31 E and R. 32 E to the northwest corner of S 6, T. 28 S, R. 32 E, then west to the southeast corner of S 36, T. 27 S, R. 31 E, then north along the range line common to R. 31 E and R. 32 E to the Kern-Tulare County boundary.
Kings County.
Madera County.
Merced County.
San Joaquin County.
Stanislaus County.
Tulare County:
Big Sandy Rancheria of Western Mono Indians of California.
Cold Springs Rancheria of Mono Indians of California.
Northfork Rancheria of Mono Indians of California.
Picayune Rancheria of Chukchansi Indians of California.
Santa Rosa Indian Community of the Santa Rosa Rancheria.
Table Mountain Rancheria of California.
Tule River Indian Tribe of the Tule River Reservation.
San Luis Obispo (Eastern part), CA		Nonattainment		Marginal.
San Luis Obispo County (part):
That portion of San Luis Obispo County that lies east of a line described as follows: Beginning at the San Luis Obispo County/Santa Barbara County boundary and running north along 120 degrees 24 minutes longitude to the intersection with 35 degrees 27 minutes latitude; east along 35 degrees 27 minutes latitude to the intersection with 120 degrees 18 minutes longitude; then north along 120 degrees 18 minutes longitude to the San Luis Obispo County/Monterey County boundary.
Sutter Buttes, CA		Nonattainment		Marginal.
Sutter County (part):
That portion of the Sutter Buttes mountain range at or above 2,000 feet in elevation.
Tuolumne County, CA		Nonattainment		Marginal.
Tuolumne County:
Chicken Ranch Rancheria of Me-Wuk Indians of California.
Tuolumne Band of Me-Wuk Indians of the Tuolumne Rancheria of California.
Tuscan Buttes, CA		Nonattainment		Marginal (Rural Transport).
Tehama County (part):
Those portions of the immediate Tuscan Buttes area at or above 1,800 feet in elevation.
Ventura County, CA		Nonattainment		Serious.
Ventura County (part):
That part of Ventura County excluding the Channel Islands of Anacapa and San Nicolas Islands.
Morongo Band of Mission Indians⁴		Nonattainment		Serious.
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation:		Nonattainment	11/7/22	Moderate.
Includes the main body of the contiguous Pechanga Band Reservation and the noncontiguous area known as Pu'eska Mountain, excluding non-contiguous tribal lands in the Los Angeles-South Coast Air Basin, CA (Meadowbrook parcel).³
Rest of State:
Colusa County		Attainment/Unclassifiable
Eastern Nevada County		Attainment/Unclassifiable
Nevada County (part) remainder.
Eastern Riverside County		Attainment/Unclassifiable
Riverside County (part) remainder.
Glenn County		Attainment/Unclassifiable
Inyo County		Attainment/Unclassifiable
Lake County	1/16/18	Attainment/Unclassifiable
Lake Tahoe Air Basin		Attainment/Unclassifiable
El Dorado County (part) remainder.
Placer County (part) remainder.
North Central Coast Air Basin		Attainment/Unclassifiable
Monterey County.
San Benito County.
Santa Cruz County.
North Coast Air Basin		Attainment/Unclassifiable
Del Norte County	1/16/18
Humboldt County	1/16/18
Mendocino County.
Sonoma County (part) remainder.
Trinity County.
Northeast Plateau Air Basin	1/16/18	Attainment/Unclassifiable
Lassen County.
Modoc County.
Siskiyou County.
Northeastern Kern County		Attainment/Unclassifiable
Kern County (part) remainder.
Northeast San Bernardino County		Attainment/Unclassifiable
San Bernardino County (part) remainder.
Northern Channel Islands.		Attainment/Unclassifiable
The Channel Islands located in the South Central Coast Air Basin: Anacapa, San Miguel, San Nicholas, Santa Barbara, Santa Cruz, and Santa Rosa Islands.
Northern Great Basin Valleys Air Basin		Attainment/Unclassifiable
Alpine County.
Mono County.
Northern Mountain Counties		Attainment/Unclassifiable
Plumas County.
Sierra County.
Santa Barbara County (part) remainder		Attainment/Unclassifiable
That part of Santa Barbara County excluding the Channel Islands of San Miguel, Santa Barbara, Santa Cruz, and Santa Rosa Islands.
Shasta County		Attainment/Unclassifiable
Sutter and Yuba Counties		Attainment/Unclassifiable
Sutter County (part) remainder.
Yuba County.
Tehama County (part) remainder		Attainment/Unclassifiable
Western San Luis Obispo County		Attainment/Unclassifiable
San Luis Obispo County (part) remainder.

² This date is August 3, 2018, unless otherwise noted.

³ See Section 23.0 of the EPA's technical support document for California, titled "California Final Area Designations for the 2015 Ozone National Ambient Air Quality Standards Technical Support Document (TSD)," for more information and maps showing the locations of the main body of the reservation and the non-contiguous Pu'eska Mountain and Meadowbrook lands (available in Docket ID: EPA-HQ-OAR-2017-0548).

⁴ See Section 22.0 of the EPA's technical support document for California, titled "California Final Area Designations for the 2015 Ozone National Ambient Air Quality Standards Technical Support Document (TSD)," for more information and maps showing the boundaries of the nonattainment area (available in Docket ID: EPA-HQ-OAR-2017-0548).

California-2008 Lead NAAQS

Designated area	Designation for the 2008 NAAQS^a
Designated area	Date¹	Type
Los Angeles County-South Coast Air Basin, CA:
Los Angeles County (part)	12/31/10	Nonattainment.
That portion of Los Angeles County which lies south and west of line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the Township line common to Township 3 North and Township 2 North, San Bernardino Base and Meridian; then North along the range line common to Range 8 West and Range 9 West; then west along the Township line common to Township 4 North and Township 3 North; then north along the range line common to Range 12 West and Range 13 West to the southeast corner of Section 12, Township 5 North and Range 13 West; then west along the south boundaries of Sections 12, 11, 10, 9, 8, and 7, Township 5 North and Range 13 West to the boundary of the Angeles National Forest which is collinear with the range line common to Range 13 West and Range 14 West; then north and west along the Angeles National Forest boundary to the point of intersection with the Township line common to Township 7 North and Township 6 North (point is at the northwest corner of Section 4 in Township 6 North and Range 14 West); then west along the Township line common to Township 7 North and Township 6 North; then north along the range line common to Range 15 West and Range 16 West to the southeast corner of Section 13, Township 7 North and Range 16 West; then along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, Township 7 North and Range 16 West; then north along the range line common to Range 16 West and Range 17 West to the north boundary of the Angeles National Forest (collinear with The Township line common to Township 8 North and Township 7 North); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary.
Rest of State		Unclassifiable/Attainment.

^a Includes Indian Country located in each county or area, except as otherwise specified.

¹ December 31, 2011 unless otherwise noted.

40 C.F.R. §81.305

43 FR 8964, Mar. 3, 1978

81 FR 1520, 1/13/2016; 81 FR 3000, 1/20/2016; 81 FR 26711, 5/4/2016; 82 FR 54238, 1/16/2018; 83 FR 1108, 4/9/2018; 83 FR 25786, 8/3/2018; 83 FR 31336, 8/6/2018; 83 FR 32066, 8/10/2018; 83 FR 52160, 11/15/2018; 84 FR 32844, 7/10/2019; 84 FR 44249, 9/23/2019; 85 FR 57736, 10/16/2020; 85 FR 58293, 10/19/2020; 85 FR 71269, 12/9/2020; 86 FR 14832, 3/19/2021; 86 FR 29524, 7/2/2021; 86 FR 30206, 7/7/2021; 86 FR 59648, 11/29/2021; 86 FR 67343, 12/27/2021; 87 FR 60915, 60935, 11/7/2022; 87 FR 80078, 1/30/2023; 88 FR 14293, 4/7/2023

For FEDERAL REGISTER citations affecting § 81.305 , see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.