40 C.F.R. § 81.327
Current through October 31, 2024
Montana-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 |
| Laurel Area | X | |||
| East Helena Area | X | |||
| Anaconda Area | X | |||
| Rest of State | X |
Montana-2010 Sulfur Dioxide NAAQS
[Primary]
| Designated area1 | Designation | |
| Date2 | Type | |
| Yellowstone County (part) | 5/10/16 | Attainment. |
| The area originates at the point defined as the southwest corner of Section 11, Township 1S, Range 26E. From that point the boundary proceeds north along the western section line of Section 11 to the point of intersection with the midline of Interstate Highway 90. From that point the boundary follows the midline of Interstate Highway 90, across the Yellowstone River, to the point where the highway midline intersects the northern boundary of Section 35, Township 1N, Range 26E. From that point the boundary proceeds east along the northern section line of Sections 35 and 36 to the point where Old US 87/Hardin Road leaves the section line and turns southeast. The boundary follows the midline of Old US 87/Hardin Road southeast to the point where the road intersects the western boundary of the SE 1/4 of the SE 1/4 of Section 31, Township 1N, Range 27E. From that point the boundary proceeds south along the 1/4 section line to the southern boundary of Township 1N, then east to the northeast corner of Section 5, Township 1S, Range 27E. The boundary then proceeds south along the eastern section line of sections 5 and 8 to the southeast corner of Section 8, Township 1S, Range 27E, where it turns west and follows the south section line of Sections 8 and 7, Township 1S, Range 27E; and Sections 12 and 11, Township 1S, Range 26E, back to the point of origin | ||
| Beaverhead County | Attainment/Unclassifiable. | |
| Big Horn County | Attainment/Unclassifiable. | |
| Blaine County | Attainment/Unclassifiable. | |
| Broadwater County | Attainment/Unclassifiable. | |
| Carbon County | Attainment/Unclassifiable. | |
| Carter County | Attainment/Unclassifiable. | |
| Cascade County | Attainment/Unclassifiable. | |
| Chouteau County | Attainment/Unclassifiable. | |
| Custer County | Attainment/Unclassifiable. | |
| Daniels County | Attainment/Unclassifiable. | |
| Dawson County | Attainment/Unclassifiable. | |
| Deer Lodge County | Attainment/Unclassifiable. | |
| Fallon County | Attainment/Unclassifiable. | |
| Fergus County | Attainment/Unclassifiable. | |
| Flathead County | Attainment/Unclassifiable. | |
| Gallatin County | Attainment/Unclassifiable. | |
| Garfield County | Attainment/Unclassifiable. | |
| Glacier County | Attainment/Unclassifiable. | |
| Golden Valley County | Attainment/Unclassifiable. | |
| Granite County | Attainment/Unclassifiable. | |
| Hill County | Attainment/Unclassifiable. | |
| Jefferson County | Attainment/Unclassifiable. | |
| Judith Basin County | Attainment/Unclassifiable. | |
| Lake County | Attainment/Unclassifiable. | |
| Lewis and Clark County | Attainment/Unclassifiable. | |
| Liberty County | Attainment/Unclassifiable. | |
| Lincoln County | Attainment/Unclassifiable. | |
| McCone County | Attainment/Unclassifiable. | |
| Madison County | Attainment/Unclassifiable. | |
| Meagher County | Attainment/Unclassifiable. | |
| Mineral County | Attainment/Unclassifiable. | |
| Missoula County | Attainment/Unclassifiable. | |
| Musselshell County | Attainment/Unclassifiable. | |
| Park County | Attainment/Unclassifiable. | |
| Petroleum County | Attainment/Unclassifiable. | |
| Phillips County | Attainment/Unclassifiable. | |
| Pondera County | Attainment/Unclassifiable. | |
| Powder River County | Attainment/Unclassifiable. | |
| Powell County | Attainment/Unclassifiable. | |
| Prairie County | Attainment/Unclassifiable. | |
| Ravalli County | Attainment/Unclassifiable. | |
| Richland County | Attainment/Unclassifiable. | |
| Roosevelt County | Attainment/Unclassifiable. | |
| Rosebud County | Attainment/Unclassifiable. | |
| Sanders County | Attainment/Unclassifiable. | |
| Sheridan County | Attainment/Unclassifiable. | |
| Silver Bow County | Attainment/Unclassifiable. | |
| Stillwater County | Attainment/Unclassifiable. | |
| Sweet Grass County | Attainment/Unclassifiable. | |
| Teton County | Attainment/Unclassifiable. | |
| Toole County | Attainment/Unclassifiable. | |
| Treasure County | Attainment/Unclassifiable. | |
| Valley County | Attainment/Unclassifiable. | |
| Wheatland County | Attainment/Unclassifiable. | |
| Wibaux County | Attainment/Unclassifiable. | |
| Yellowstone County (part) (remainder) | Attainment/Unclassifiable. | |
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.
Montana-Carbon Monoxide
| Designated Area | Designation | Classification | ||
| Date1 | Type | Date1 | Type | |
| Billings Area | ||||
| Yellowstone County (part): | ||||
| The following areas of Yellowstone Co. (Range and Township) sections: R25E T1N-Sections 24 through 27 and 34 through 36; R25E T1S-Sections 1, 2, and 12; R26E T1N Sections 19 through 22 and 27 through 34; R26E T1S Sections 2 through 11 and 15 through 18. | April 22, 2002. | Attainment | ||
| Great Falls Area | July 8, 2002 | Attainment | ||
| Cascade County (part) | ||||
| Great Falls designated area: North boundary-9th Avenue South or its straight line extension; East boundary-54th Street South or its straight line extension; South boundary-11th Avenue South or its straight line extension; West boundary-2nd Street South or its straight line extension | ||||
| Missoula Area: | ||||
| Missoula County (part) | September 17, 2007 | Attainment | ||
| Missoula and vicinity including the following (Range and Township) sections: R19W T14N-sections: 29 and 32; R19W T13N-sections 2, 5, 7, 8, 11, 14 through 24, and 26 through 34; R19W T12N-sections: 4 through 7; R20W T13N-sections: 23 through 26, 35 and 36 | ||||
| Beaverhead County | Unclassifiable/Attainment | |||
| Big Horn County (part) excluding Crow, Northern Cheyenne Indian Reservations | Unclassifiable/Attainment | |||
| Blaine County (part) excluding Fort Belknap Indian Reservation | Unclassifiable/Attainment | |||
| Broadwater County | Unclassifiable/Attainment | |||
| Carbon County | Unclassifiable/Attainment | |||
| Carter County | Unclassifiable/Attainment | |||
| Cascade County (part) | ||||
| Remainder of Cascade County | Unclassifiable/Attainment | |||
| Chouteau County (part) excluding Rocky Boy Indian Reservation | Unclassifiable/Attainment | |||
| Custer County | Unclassifiable/Attainment | |||
| Daniels County (part) excluding Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Dawson County | Unclassifiable/Attainment | |||
| Deer Lodge County | Unclassifiable/Attainment | |||
| Fallon County | Unclassifiable/Attainment | |||
| Fergus County | Unclassifiable/Attainment | |||
| Flathead County (part) excluding Flathead Indian Resevation | Unclassifiable/Attainment | |||
| Gallatin County | Unclassifiable/Attainment | |||
| Garfield County | Unclassifiable/Attainment | |||
| Glacier County (part) excluding Blackfeet Indian Reservation | Unclassifiable/Attainment | |||
| Golden Valley County | Unclassifiable/Attainment | |||
| Granite County | Unclassifiable/Attainment | |||
| Hill County (part) excluding Rocky Boy Indian Reservation | Unclassifiable/Attainment | |||
| Jefferson County | Unclassifiable/Attainment | |||
| Judith Basin County | Unclassifiable/Attainment | |||
| Lake County (part) excluding Flathead Indian Reservation | Unclassifiable/Attainment | |||
| Lewis and Clark County | Unclassifiable/Attainment | |||
| Liberty County | Unclassifiable/Attainment | |||
| Lincoln County | Unclassifiable/Attainment | |||
| Madison County | Unclassifiable/Attainment | |||
| McCone County | Unclassifiable/Attainment | |||
| Meagher County | Unclassifiable/Attainment | |||
| Mineral County | Unclassifiable/Attainment | |||
| Missoula County (part) | ||||
| Remainder of Missoula County | Unclassifiable/Attainment | |||
| Musselshell County | Unclassifiable/Attainment | |||
| Park County | Unclassifiable/Attainment | |||
| Petroleum County | Unclassifiable/Attainment | |||
| Phillips County (part) excluding Fort Belknap Indian Reservation | Unclassifiable/Attainment | |||
| Pondera County (part) excluding Blackfeet Indian Reservation | Unclassifiable/Attainment | |||
| Powder River County | Unclassifiable/Attainment | |||
| Powell County | Unclassifiable/Attainment | |||
| Prairie County | Unclassifiable/Attainment | |||
| Ravalli County | Unclassifiable/Attainment | |||
| Richland County | Unclassifiable/Attainment | |||
| Roosevelt County (part) excluding Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Rosebud County (part) excluding Northern Cheyenne Indian Reservation | Unclassifiable/Attainment | |||
| Sanders County (part) excluding Flathead Indian Reservation | Unclassifiable/Attainment | |||
| Sheridan County (part) excluding Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Silver Bow County | Unclassifiable/Attainment | |||
| Stillwater County | Unclassifiable/Attainment | |||
| Sweet Grass County | Unclassifiable/Attainment | |||
| Teton County | Unclassifiable/Attainment | |||
| Toole County | Unclassifiable/Attainment | |||
| Treasure County | Unclassifiable/Attainment | |||
| Valley County (part) excluding Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Wheatland County | Unclassifiable/Attainment | |||
| Wibaux County | Unclassifiable/Attainment | |||
| Yellowstone County (part) | ||||
| Remainder of Yellowstone County | Unclassifiable/Attainment | |||
| Yellowstone National Park | Unclassifiable/Attainment | |||
| Blackfeet Indian Reservation | Unclassifiable/Attainment | |||
| Glacier County (part) | ||||
| area inside Blackfeet Reservation | ||||
| Pondera County (part) | ||||
| area inside Blackfeet Reservation | ||||
| Crow Indian Reservation | Unclassifiable/Attainment | |||
| Bighorn County (part) | ||||
| area inside Crow Reservation | ||||
| Yellowstone (part) | ||||
| area inside Crow Reservation | ||||
| Flathead Indian Reservation | Unclassifiable/Attainment | |||
| Flathead County (part) | ||||
| area inside Flathead Reservation | ||||
| Lake County (part) | ||||
| area inside Flathead Reservation | ||||
| Missoula County (part) | ||||
| area inside Flathead Reservation | ||||
| Sanders County (part) | ||||
| area inside Flathead Reservation | ||||
| Fort Belknap Indian Reservation | Unclassifiable/Attainment | |||
| Blaine County (part) | ||||
| area inside Fort Belknap Reservation | ||||
| Phillips County (part) | ||||
| area inside Fort Belknap Reservation | ||||
| Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Daniels County (part) | ||||
| area inside Fort Peck Reservation | ||||
| Roosevelt County (part) | ||||
| area inside Fort Peck Reservation | ||||
| Sheridan County (part) | ||||
| area inside Fort Peck Reservation | ||||
| Valley County (part) | ||||
| area inside Fort Peck Reservation | ||||
| Northern Cheyenne Indian Reservation | Unclassifiable/Attainment | |||
| Bighorn County (part) | ||||
| area inside Northern Cheyenne Reservation | ||||
| Rosebud County (part) | ||||
| area inside Northern Cheyenne Reservation | ||||
| Rocky Boy Indian Reservation | Unclassifiable/Attainment | |||
| Chouteau County (part) | ||||
| area inside Rocky Boy Reservation | ||||
| Hill County (part) | ||||
| area inside Rocky Boy Reservation | ||||
1 This date is November 15, 1990, unless otherwise noted.
Montana-1978 Lead NAAQS
| Designated Area | Designation | Classification | ||
| Date | Type | Date | Type | |
| Lewis & Clark County (part) | ||||
| City of East Helena and vicinity | October 11, 2019 | Attainment. | ||
| Northern boundary - horizontal universal transverse mercatur(UTM) 5,162,000 mN; eastern boundary - vertical UTM 432,500 mE; southern boundary - horizontal UTM 5,158,000 mN; western boundary - vertical UTM 427,000 mE | ||||
| Rest of State Not Designated | ||||
Montana-Ozone (1-Hour Standard)2
| Designated area | Designation | Classification | ||
| Date1 | Type | Date1 | Type | |
| Beaverhead County | Unclassifiable/Attainment | |||
| Big Horn County (part) excluding Crow, Northern Cheyenne Indian Reservations | Unclassifiable/Attainment | |||
| Blaine County (part) excluding Fort Belknap Indian Reservation | ||||
| Broadwater County | Unclassifiable/Attainment | |||
| Carbon County | Unclassifiable/Attainment | |||
| Carter County | Unclassifiable/Attainment | |||
| Cascade County | Unclassifiable/Attainment | |||
| Chouteau County (part) excluding Rocky Boy Indian Reservation | Unclassifiable/Attainment | |||
| Custer County | Unclassifiable/Attainment | |||
| Daniels County (part) excluding Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Dawson County | Unclassifiable/Attainment | |||
| Deer Lodge County | Unclassifiable/Attainment | |||
| Fallon County | Unclassifiable/Attainment | |||
| Fergus County | Unclassifiable/Attainment | |||
| Flathead County (part) excluding Flathead Indian Reservation | Unclassifiable/Attainment | |||
| Gallatin County | Unclassifiable/Attainment | |||
| Garfield County | Unclassifiable/Attainment | |||
| Glacier County (part) excluding Blackfeet Indian Reservation | Unclassifiable/Attainment | |||
| Golden Valley County | Unclassifiable/Attainment | |||
| Granite County | Unclassifiable/Attainment | |||
| Hill County (part) excluding Rocky Boy Indian Reservation | Unclassifiable/Attainment | |||
| Jefferson County | Unclassifiable/Attainment | |||
| Judith Basin County | Unclassifiable/Attainment | |||
| Lake County (part) excluding Flathead Indian Reservation | Unclassifiable/Attainment | |||
| Lewis and Clark County | Unclassifiable/Attainment | |||
| Liberty County | Unclassifiable/Attainment | |||
| Lincoln County | Unclassifiable/Attainment | |||
| Madison County | Unclassifiable/Attainment | |||
| McCone County | Unclassifiable/Attainment | |||
| Meagher County | Unclassifiable/Attainment | |||
| Mineral County | Unclassifiable/Attainment | |||
| Missoula County (part) excluding Flathead Indian Reservation | Unclassifiable/Attainment | |||
| Musselshell County | Unclassifiable/Attainment | |||
| Park County | Unclassifiable/Attainment | |||
| Petroleum County | Unclassifiable/Attainment | |||
| Phillips County (part) excluding Fort Belknap Indian Reservation | Unclassifiable/Attainment | |||
| Pondera County (part) excluding Blackfeet Indian Reservation | Unclassifiable/Attainment | |||
| Powder River County | Unclassifiable/Attainment | |||
| Powell County | Unclassifiable/Attainment | |||
| Prairie County | Unclassifiable/Attainment | |||
| Ravalli County | Unclassifiable/Attainment | |||
| Richland County | Unclassifiable/Attainment | |||
| Roosevelt County (part) excluding Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Rosebud County (part) excluding Northern Cheyenne Indian Reservation | Unclassifiable/Attainment | |||
| Sanders County (part) excluding Flathead Indian Reservation | Unclassifiable/Attainment | |||
| Sheridan County (part) excluding Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Silver Bow County | Unclassifiable/Attainment | |||
| Stillwater County | Unclassifiable/Attainment | |||
| Sweet Grass County | Unclassifiable/Attainment | |||
| Teton County | Unclassifiable/Attainment | |||
| Toole County | Unclassifiable/Attainment | |||
| Treasure County | Unclassifiable/Attainment | |||
| Valley County (part) excluding Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Wheatland County | Unclassifiable/Attainment | |||
| Wibaux County | Unclassifiable/Attainment | |||
| Yellowstone County (part) excluding Crow Indian Reservation | Unclassifiable/Attainment | |||
| Yellowstone Natl Park | Unclassifiable/Attainment | |||
| Blackfeet Indian Reservation | Unclassifiable/Attainment | |||
| Glacier County (part) area inside Blackfeet Reservation | ||||
| Pondera County (part) area inside Blackfeet Reservation | ||||
| Crow Indian Reservation | Unclassifiable/Attainment | |||
| Bighorn County (part) area inside Crow Reservation | ||||
| Yellowstone (part) area inside Crow Reservation | ||||
| Flathead Indian Reservation | Unclassifiable/Attainment | |||
| Flathead County (part) area inside Flathead Reservation | ||||
| Lake County (part) area inside Flathead Reservation | ||||
| Missoula County (part) area inside Flathead Reservation | ||||
| Sanders County (part) area inside Flathead Reservation | ||||
| Fort Belknap Indian Reservation | Unclassifiable/Attainment | |||
| Blaine County (part) area inside Fort Belknap Reservation | ||||
| Phillips County (part) area inside Fort Belknap Reservation | ||||
| Fort Peck Indian Reservation | Unclassifiable/Attainment | |||
| Daniels County (part) area inside Fort Peck Reservation | ||||
| Roosevelt County (part) area inside Fort Peck Reservation | ||||
| Sheridan County (part) area inside Fort Peck Reservation | ||||
| Valley County (part) area inside Fort Peck Reservation | ||||
| Northern Cheyenne Indian Reservation | Unclassifiable/Attainment | |||
| Bighorn County (part) area inside Northern Cheyenne Reservation | ||||
| Rosebud County (part) area inside Northern Cheyenne Reservation | ||||
| Rocky Boy Indian Reservation | Unclassifiable/Attainment | |||
| Chouteau County (part) area inside Rocky Boy Reservation | ||||
| Hill County (part) area inside Rocky Boy Reservation | ||||
1 This date is October 18, 2000, unless otherwise noted.
2 The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in Montana.
Montana-PM-10
| Designated Area | Designation | Classification | ||
| Date | Type | Date | Type | |
| Cascade County, Great Falls area | 11/15/90 | Unclassifiable | ||
| Flathead County: | ||||
| The area bounded by lines from Universal Transmercator (UTM) coordinate 700000mE, 5347000mN, east to 704000mE, 5347000mN, south to 704000mE, 5341000mN, west to 703000mE, 5341000mN, south to 703000mE, 5340000mN, west to 702000mE, 5340000mN, south to 702000mE, 5339000mN, east to 703000mE, 5339000mN, south to 703000mE, 5338000mN, east to 704000mE, 5338000mN, south to 704000mE, 5336000mN, west to 702000mE, 5336000mN, south to 702000mE, 5335000mN, west to 700000mE, 5335000mN, north to 700000mE, 5340000mN, west to 695000mE, 5340000mN, north to 695000mE, 5345000mN, east to 700000mE, 5345000mN, north to 700000mE, 5347000mN | 7/27/2020 | Attainment. | ||
| Columbia Falls and vicinity | 11/15/90 | Nonattainment | 11/15/90 | Moderate. |
| Township T30N, R20W-Sections 7, 8, 9, 16, 17, and 18 | ||||
| The City of Whitefish and surrounding vicinity bounded by lines from Universal Transmercator (UTM) coordinates 695000 mE, 5370000 mN, east to 699000 mE, 5370000 mN, south to 699000 mE, 5361000 mN, west to 695000 mN, 5361000 mN, and north to 695000 mE, 5370000 mN | 7/8/2022 | Attainment | ||
| Lake County, Ronan, Polson | 11/15/90 | Nonattainment | 11/15/90 | Moderate. |
| Lincoln County, Libby and vicinity | 11/15/90 | Nonattainment | 11/15/90 | Moderate. |
| T30N, R31W-Sections 2, 3, 4, 5, 9, 10, 11, 14, 15, 23, 26, 35, and west 1/2 of Section 24, west 1/2 of Section 25, and west 1/2 of Section 36; plus T31N, R31W-Sections 26, 27, 29, 32, 33, 34, 35 and the east 1/2 of Section 30. | ||||
| Lewis and Clark County, East Helena area | 11/15/90 | Unclassifiable | ||
| Missoula County, Missoula and vicinity including the following sections: | 6/24/2019 | Attainment | ||
| T13N, R19W-2, 8, 11, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 27, 28, 29, 30, 31, 32, 33, and 34; T12N, R19W-Sections 4, 5, 6, 7; T13N, R20W-Sections 23, 24, 25, 26, 35, and 36. | ||||
| Rosebud County: | ||||
| Lame Deer | 11/15/90 | Nonattainment | 11/15/90 | Moderate. |
| Colstrip area | 11/15/90 | Unclassifiable | ||
| Sanders County (part) | 7/8/2022 | Attainment | ||
| Thompson Falls and vicinity: Including the following Sections: R29W, T21N-Sections 5, 6, 7, 8, 9, 10, 15, and 16 | ||||
| Silver Bow County, Butte | 7/26/2021 | Attainment. | ||
| The following area of Butte-Silver Bow excluding the territorial limits of the City of Walkerville: Beginning at the Northwest corner of Section 2, T.3N., R.8W., thence Easterly to Northeast corner Section 5, T.3N., R.7W.; then Southerly to Northwest corner Section 9, T.3N., R.7W.; thence Easterly to Northeast corner Section 10, T.3N., R.7W.; thence Southerly to Southeast corner Section 22, T.2N., R.7W.; thence Westerly to Southwest corner Section 19, T.2N., R.7W.; thence Northerly to Northwest corner Section 19, T.2N., R.7W.; thence Westerly to Southwest corner Section 14, T.2N., R.8W.; thence Northerly to Southwest corner Section 35, T.3N., R.8W.; thence Westerly to Southwest corner Section 34, T.3N., R.8W.; thence Northerly to Northwest corner Section 27, T.3N., R.8W.; thence Westerly to Southwest corner Section 20, T.3N., R.8W.; thence Northerly to Northwest corner Section 17, T.3N., R.8W.; thence Easterly to Northwest corner Section 14, T.3N., R.8W.; thence Northerly to the point of beginning. | ||||
| Yellowstone County, Billings area | 11/15/90 | Unclassifiable | ||
| Rest of State1 | 11/15/90 | Unclassifiable | ||
1 Denotes a single area designation for PSD baseline area purposes.
Montana-1997 Annual PM2.5 NAAQS
[Primary and Secondary]
| Designated area | Designationa | Classification | ||
| Date1 | Type | Date2 | Type | |
| Libby, MT: | ||||
| Lincoln County (part) | 8/23/23 | Attainment | ||
| The area bounded by lines from Universal Transverse Mercador Zone 11 (North American Datum 1983) coordinates beginning at 600,000mE, 5,370,000mN east to 620,000mE, 5370,000mN south to 620,000mE, 5340,000mN west to 600,000mE, 5,340,000mN north to 600,000mE, 5,370,000mN | ||||
| Rest of State: | ||||
| Beaverhead County | Unclassifiable/Attainment. | |||
| Big Horn County | Unclassifiable/Attainment. | |||
| Blaine County | Unclassifiable/Attainment. | |||
| Broadwater County | Unclassifiable/Attainment. | |||
| Carbon County | Unclassifiable/Attainment. | |||
| Carter County | Unclassifiable/Attainment. | |||
| Cascade County | Unclassifiable/Attainment. | |||
| Chouteau County | Unclassifiable/Attainment. | |||
| Custer County | Unclassifiable/Attainment. | |||
| Daniels County | Unclassifiable/Attainment. | |||
| Dawson County | Unclassifiable/Attainment. | |||
| Deer Lodge County | Unclassifiable/Attainment. | |||
| Fallon County | Unclassifiable/Attainment. | |||
| Fergus County | Unclassifiable/Attainment. | |||
| Flathead County | Unclassifiable/Attainment. | |||
| Gallatin County | Unclassifiable/Attainment. | |||
| Garfield County | Unclassifiable/Attainment. | |||
| Glacier County | Unclassifiable/Attainment. | |||
| Golden Valley County | Unclassifiable/Attainment. | |||
| Granite County | Unclassifiable/Attainment. | |||
| Hill County | Unclassifiable/Attainment. | |||
| Jefferson County | Unclassifiable/Attainment. | |||
| Judith Basin County | Unclassifiable/Attainment. | |||
| Lake County | Unclassifiable/Attainment. | |||
| Lewis and Clark County | Unclassifiable/Attainment. | |||
| Liberty County | Unclassifiable/Attainment. | |||
| Lincoln County (remainder) | Unclassifiable/Attainment. | |||
| McCone County | Unclassifiable/Attainment. | |||
| Madison County | Unclassifiable/Attainment. | |||
| Meagher County | Unclassifiable/Attainment. | |||
| Mineral County | Unclassifiable/Attainment. | |||
| Missoula County | Unclassifiable/Attainment. | |||
| Musselshell County | Unclassifiable/Attainment. | |||
| Park County | Unclassifiable/Attainment. | |||
| Petroleum County | Unclassifiable/Attainment. | |||
| Phillips County | Unclassifiable/Attainment. | |||
| Pondera County | Unclassifiable/Attainment. | |||
| Powder River County | Unclassifiable/Attainment. | |||
| Powell County | Unclassifiable/Attainment. | |||
| Prairie County | Unclassifiable/Attainment. | |||
| Ravalli County | Unclassifiable/Attainment. | |||
| Richland County | Unclassifiable/Attainment. | |||
| Roosevelt County | Unclassifiable/Attainment. | |||
| Rosebud County | Unclassifiable/Attainment. | |||
| Sanders County | Unclassifiable/Attainment. | |||
| Sheridan County | Unclassifiable/Attainment. | |||
| Silver Bow County | Unclassifiable/Attainment. | |||
| Stillwater County | Unclassifiable/Attainment. | |||
| Sweet Grass County | Unclassifiable/Attainment. | |||
| Teton County | Unclassifiable/Attainment. | |||
| Toole County | Unclassifiable/Attainment. | |||
| Treasure County | Unclassifiable/Attainment. | |||
| Valley County | Unclassifiable/Attainment. | |||
| Wheatland County | Unclassifiable/Attainment. | |||
| Wibaux County | Unclassifiable/Attainment. | |||
| Yellowstone 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.
Montana-2012 Annual PM2.5 NAAQS
[Primary]
| Designated area1 | Designation | Classification | ||
| Date2 | Type | Date2 | Type | |
| Statewide: | ||||
| Beaverhead County | Unclassifiable/Attainment | |||
| Big Horn County | Unclassifiable/Attainment | |||
| Blaine County | Unclassifiable/Attainment | |||
| Broadwater County | Unclassifiable/Attainment | |||
| Carbon County | Unclassifiable/Attainment | |||
| Carter County | Unclassifiable/Attainment | |||
| Cascade County | Unclassifiable/Attainment | |||
| Chouteau County | Unclassifiable/Attainment | |||
| Custer County | Unclassifiable/Attainment | |||
| Daniels County | Unclassifiable/Attainment | |||
| Dawson County | Unclassifiable/Attainment | |||
| Deer Lodge County | Unclassifiable/Attainment | |||
| Fallon County | Unclassifiable/Attainment | |||
| Fergus County | Unclassifiable/Attainment | |||
| Flathead County | Unclassifiable/Attainment | |||
| Gallatin County | Unclassifiable/Attainment | |||
| Garfield County | Unclassifiable/Attainment | |||
| Glacier County | Unclassifiable/Attainment | |||
| Golden Valley County | Unclassifiable/Attainment | |||
| Granite County | Unclassifiable/Attainment | |||
| Hill County | Unclassifiable/Attainment | |||
| Jefferson County | Unclassifiable/Attainment | |||
| Judith Basin County | Unclassifiable/Attainment | |||
| Lake County | Unclassifiable/Attainment | |||
| Lewis and Clark County | Unclassifiable/Attainment | |||
| Liberty County | Unclassifiable/Attainment | |||
| Lincoln County | Unclassifiable/Attainment | |||
| McCone County | Unclassifiable/Attainment | |||
| Madison County | Unclassifiable/Attainment | |||
| Meagher County | Unclassifiable/Attainment | |||
| Mineral County | Unclassifiable/Attainment | |||
| Missoula County | Unclassifiable/Attainment | |||
| Musselshell County | Unclassifiable/Attainment | |||
| Park County | Unclassifiable/Attainment | |||
| Petroleum County | Unclassifiable/Attainment | |||
| Phillips County | Unclassifiable/Attainment | |||
| Pondera County | Unclassifiable/Attainment | |||
| Powder River County | Unclassifiable/Attainment | |||
| Powell County | Unclassifiable/Attainment | |||
| Prairie County | Unclassifiable/Attainment | |||
| Ravalli County | Unclassifiable/Attainment | |||
| Richland County | Unclassifiable/Attainment | |||
| Roosevelt County | Unclassifiable/Attainment | |||
| Rosebud County | Unclassifiable/Attainment | |||
| Sanders County | Unclassifiable/Attainment | |||
| Sheridan County | Unclassifiable/Attainment | |||
| Silver Bow County | Unclassifiable/Attainment | |||
| Stillwater County | Unclassifiable/Attainment | |||
| Sweet Grass County | Unclassifiable/Attainment | |||
| Teton County | Unclassifiable/Attainment | |||
| Toole County | Unclassifiable/Attainment | |||
| Treasure County | Unclassifiable/Attainment | |||
| Valley County | Unclassifiable/Attainment | |||
| Wheatland County | Unclassifiable/Attainment | |||
| Wibaux County | Unclassifiable/Attainment | |||
| Yellowstone County | 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.
Montana-1997 24-Hour PM2.5 NAAQS
[Primary and Secondary]
| Designated area | Designationa | Classification | ||
| Date1 | Type | Date | Type | |
| Statewide: | ||||
| Beaverhead County | Unclassifiable/Attainment. | |||
| Big Horn County | Unclassifiable/Attainment. | |||
| Blaine County | Unclassifiable/Attainment. | |||
| Broadwater County | Unclassifiable/Attainment. | |||
| Carbon County | Unclassifiable/Attainment. | |||
| Carter County | Unclassifiable/Attainment. | |||
| Cascade County | Unclassifiable/Attainment. | |||
| Chouteau County | Unclassifiable/Attainment. | |||
| Custer County | Unclassifiable/Attainment. | |||
| Daniels County | Unclassifiable/Attainment. | |||
| Dawson County | Unclassifiable/Attainment. | |||
| Deer Lodge County | Unclassifiable/Attainment. | |||
| Fallon County | Unclassifiable/Attainment. | |||
| Fergus County | Unclassifiable/Attainment. | |||
| Flathead County | Unclassifiable/Attainment. | |||
| Gallatin County | Unclassifiable/Attainment. | |||
| Garfield County | Unclassifiable/Attainment. | |||
| Glacier County | Unclassifiable/Attainment. | |||
| Golden Valley County | Unclassifiable/Attainment. | |||
| Granite County | Unclassifiable/Attainment. | |||
| Hill County | Unclassifiable/Attainment. | |||
| Jefferson County | Unclassifiable/Attainment. | |||
| Judith Basin County | Unclassifiable/Attainment. | |||
| Lake County | Unclassifiable/Attainment. | |||
| Lewis and Clark County | Unclassifiable/Attainment. | |||
| Liberty County | Unclassifiable/Attainment. | |||
| Lincoln County | Unclassifiable/Attainment. | |||
| McCone County | Unclassifiable/Attainment. | |||
| Madison County | Unclassifiable/Attainment. | |||
| Meagher County | Unclassifiable/Attainment. | |||
| Mineral County | Unclassifiable/Attainment. | |||
| Missoula County | Unclassifiable/Attainment. | |||
| Musselshell County | Unclassifiable/Attainment. | |||
| Park County | Unclassifiable/Attainment. | |||
| Petroleum County | Unclassifiable/Attainment. | |||
| Phillips County | Unclassifiable/Attainment. | |||
| Pondera County | Unclassifiable/Attainment. | |||
| Powder River County | Unclassifiable/Attainment. | |||
| Powell County | Unclassifiable/Attainment. | |||
| Prairie County | Unclassifiable/Attainment. | |||
| Ravalli County | Unclassifiable/Attainment. | |||
| Richland County | Unclassifiable/Attainment. | |||
| Roosevelt County | Unclassifiable/Attainment. | |||
| Rosebud County | Unclassifiable/Attainment. | |||
| Sanders County | Unclassifiable/Attainment. | |||
| Sheridan County | Unclassifiable/Attainment. | |||
| Silver Bow County | Unclassifiable/Attainment. | |||
| Stillwater County | Unclassifiable/Attainment. | |||
| Sweet Grass County | Unclassifiable/Attainment. | |||
| Teton County | Unclassifiable/Attainment. | |||
| Toole County | Unclassifiable/Attainment. | |||
| Treasure County | Unclassifiable/Attainment. | |||
| Valley County | Unclassifiable/Attainment. | |||
| Wheatland County | Unclassifiable/Attainment. | |||
| Wibaux County | Unclassifiable/Attainment. | |||
| Yellowstone 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.
Montana-2006 24-Hour PM2.5 NAAQS
[Primary and Secondary]
| Designated area | Designationa | Classification | ||
| Date1 | Type | Date | Type | |
| Statewide: | ||||
| Beaverhead County | Unclassifiable/Attainment. | |||
| Big Horn County | Unclassifiable/Attainment. | |||
| Blaine County | Unclassifiable/Attainment. | |||
| Broadwater County | Unclassifiable/Attainment. | |||
| Carbon County | Unclassifiable/Attainment. | |||
| Carter County | Unclassifiable/Attainment. | |||
| Cascade County | Unclassifiable/Attainment. | |||
| Chouteau County | Unclassifiable/Attainment. | |||
| Custer County | Unclassifiable/Attainment. | |||
| Daniels County | Unclassifiable/Attainment. | |||
| Dawson County | Unclassifiable/Attainment. | |||
| Deer Lodge County | Unclassifiable/Attainment. | |||
| Fallon County | Unclassifiable/Attainment. | |||
| Fergus County | Unclassifiable/Attainment. | |||
| Flathead County | Unclassifiable/Attainment. | |||
| Gallatin County | Unclassifiable/Attainment. | |||
| Garfield County | Unclassifiable/Attainment. | |||
| Glacier County | Unclassifiable/Attainment. | |||
| Golden Valley County | Unclassifiable/Attainment. | |||
| Granite County | Unclassifiable/Attainment. | |||
| Hill County | Unclassifiable/Attainment. | |||
| Jefferson County | Unclassifiable/Attainment. | |||
| Judith Basin County | Unclassifiable/Attainment. | |||
| Lake County | Unclassifiable/Attainment. | |||
| Lewis and Clark County | Unclassifiable/Attainment. | |||
| Liberty County | Unclassifiable/Attainment. | |||
| Lincoln County | Unclassifiable/Attainment. | |||
| McCone County | Unclassifiable/Attainment. | |||
| Madison County | Unclassifiable/Attainment. | |||
| Meagher County | Unclassifiable/Attainment. | |||
| Mineral County | Unclassifiable/Attainment. | |||
| Missoula County | Unclassifiable/Attainment. | |||
| Musselshell County | Unclassifiable/Attainment. | |||
| Park County | Unclassifiable/Attainment. | |||
| Petroleum County | Unclassifiable/Attainment. | |||
| Phillips County | Unclassifiable/Attainment. | |||
| Pondera County | Unclassifiable/Attainment. | |||
| Powder River County | Unclassifiable/Attainment. | |||
| Powell County | Unclassifiable/Attainment. | |||
| Prairie County | Unclassifiable/Attainment. | |||
| Ravalli County | Unclassifiable/Attainment. | |||
| Richland County | Unclassifiable/Attainment. | |||
| Roosevelt County | Unclassifiable/Attainment. | |||
| Rosebud County | Unclassifiable/Attainment. | |||
| Sanders County | Unclassifiable/Attainment. | |||
| Sheridan County | Unclassifiable/Attainment. | |||
| Silver Bow County | Unclassifiable/Attainment. | |||
| Stillwater County | Unclassifiable/Attainment. | |||
| Sweet Grass County | Unclassifiable/Attainment. | |||
| Teton County | Unclassifiable/Attainment. | |||
| Toole County | Unclassifiable/Attainment. | |||
| Treasure County | Unclassifiable/Attainment. | |||
| Valley County | Unclassifiable/Attainment. | |||
| Wheatland County | Unclassifiable/Attainment. | |||
| Wibaux County | Unclassifiable/Attainment. | |||
| Yellowstone 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.
Montana-NO2 (1971 Annual Standard)
| Designated area | Does not meet primary standards | Cannot be classified or better than national standards |
| Entire State | X |
Montana-NO2 (2010 1-Hour Standard)
| Designated area | Designationa | |
| Date1 | Type | |
| Beaverhead County | Unclassifiable/Attainment. | |
| Big Horn County | Unclassifiable/Attainment. | |
| Blaine County | Unclassifiable/Attainment. | |
| Broadwater County | Unclassifiable/Attainment. | |
| Carbon County | Unclassifiable/Attainment. | |
| Carter County | Unclassifiable/Attainment. | |
| Cascade County | Unclassifiable/Attainment. | |
| Chouteau County | Unclassifiable/Attainment. | |
| Custer County | Unclassifiable/Attainment. | |
| Daniels County | Unclassifiable/Attainment. | |
| Dawson County | Unclassifiable/Attainment. | |
| Deer Lodge County | Unclassifiable/Attainment. | |
| Fallon County | Unclassifiable/Attainment. | |
| Fergus County | Unclassifiable/Attainment. | |
| Flathead County | Unclassifiable/Attainment. | |
| Gallatin County | Unclassifiable/Attainment. | |
| Garfield County | Unclassifiable/Attainment. | |
| Glacier County | Unclassifiable/Attainment. | |
| Golden Valley County | Unclassifiable/Attainment. | |
| Granite County | Unclassifiable/Attainment. | |
| Hill County | Unclassifiable/Attainment. | |
| Jefferson County | Unclassifiable/Attainment. | |
| Judith Basin County | Unclassifiable/Attainment. | |
| Lake County | Unclassifiable/Attainment. | |
| Lewis and Clark County | Unclassifiable/Attainment. | |
| Liberty County | Unclassifiable/Attainment. | |
| Lincoln County | Unclassifiable/Attainment. | |
| McCone County | Unclassifiable/Attainment. | |
| Madison County | Unclassifiable/Attainment. | |
| Meagher County | Unclassifiable/Attainment. | |
| Mineral County | Unclassifiable/Attainment. | |
| Missoula County | Unclassifiable/Attainment. | |
| Musselshell County | Unclassifiable/Attainment. | |
| Park County | Unclassifiable/Attainment. | |
| Petroleum County | Unclassifiable/Attainment. | |
| Phillips County | Unclassifiable/Attainment. | |
| Pondera County | Unclassifiable/Attainment. | |
| Powder River County | Unclassifiable/Attainment. | |
| Powell County | Unclassifiable/Attainment. | |
| Prairie County | Unclassifiable/Attainment. | |
| Ravalli County | Unclassifiable/Attainment. | |
| Richland County | Unclassifiable/Attainment. | |
| Roosevelt County | Unclassifiable/Attainment. | |
| Rosebud County | Unclassifiable/Attainment. | |
| Sanders County | Unclassifiable/Attainment. | |
| Sheridan County | Unclassifiable/Attainment. | |
| Silver Bow County | Unclassifiable/Attainment. | |
| Stillwater County | Unclassifiable/Attainment. | |
| Sweet Grass County | Unclassifiable/Attainment. | |
| Teton County | Unclassifiable/Attainment. | |
| Toole County | Unclassifiable/Attainment. | |
| Treasure County | Unclassifiable/Attainment. | |
| Valley County | Unclassifiable/Attainment. | |
| Wheatland County | Unclassifiable/Attainment. | |
| Wibaux County | Unclassifiable/Attainment. | |
| Yellowstone 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.
Montana-1997 8-Hour Ozone NAAQS
[Primary and Secondary]
| Designated area | Designationa | Category/classification | ||
| Date1 | Type | Date1 | Type | |
| Statewide: | ||||
| Beaverhead County | Unclassifiable/Attainment | |||
| Big Horn County | Unclassifiable/Attainment | |||
| Blaine County | Unclassifiable/Attainment | |||
| Broadwater County | Unclassifiable/Attainment | |||
| Carbon County | Unclassifiable/Attainment | |||
| Carter County | Unclassifiable/Attainment | |||
| Cascade County | Unclassifiable/Attainment | |||
| Chouteau County | Unclassifiable/Attainment | |||
| Custer County | Unclassifiable/Attainment | |||
| Daniels County | Unclassifiable/Attainment | |||
| Dawson County | Unclassifiable/Attainment | |||
| Deer Lodge County | Unclassifiable/Attainment | |||
| Fallon County | Unclassifiable/Attainment | |||
| Fergus County | Unclassifiable/Attainment | |||
| Flathead County | Unclassifiable/Attainment | |||
| Gallatin County | Unclassifiable/Attainment | |||
| Garfield County | Unclassifiable/Attainment | |||
| Glacier County | Unclassifiable/Attainment | |||
| Golden Valley County | Unclassifiable/Attainment | |||
| Granite County. | Unclassifiable/Attainment | |||
| Hill County | Unclassifiable/Attainment | |||
| Jefferson County | Unclassifiable/Attainment | |||
| Judith Basin County | Unclassifiable/Attainment | |||
| Lake County | Unclassifiable/Attainment | |||
| Lewis and Clark County | Unclassifiable/Attainment | |||
| Liberty County | Unclassifiable/Attainment | |||
| Lincoln County | Unclassifiable/Attainment | |||
| Madison County | Unclassifiable/Attainment | |||
| McCone County | Unclassifiable/Attainment | |||
| Meagher County | Unclassifiable/Attainment | |||
| Mineral County | Unclassifiable/Attainment | |||
| Missoula County | Unclassifiable/Attainment | |||
| Musselshell County | Unclassifiable/Attainment | |||
| Park County | Unclassifiable/Attainment | |||
| Petroleum County | Unclassifiable/Attainment | |||
| Phillips County | Unclassifiable/Attainment | |||
| Pondera County | Unclassifiable/Attainment | |||
| Powder River County | Unclassifiable/Attainment | |||
| Powell County | Unclassifiable/Attainment | |||
| Prairie County | Unclassifiable/Attainment | |||
| Ravalli County | Unclassifiable/Attainment | |||
| Richland County | Unclassifiable/Attainment | |||
| Roosevelt County | Unclassifiable/Attainment | |||
| Rosebud County | Unclassifiable/Attainment | |||
| Sanders County | Unclassifiable/Attainment | |||
| Sheridan County | Unclassifiable/Attainment | |||
| Silver Bow County | Unclassifiable/Attainment | |||
| Stillwater County | Unclassifiable/Attainment | |||
| Sweet Grass County | Unclassifiable/Attainment | |||
| Teton County | Unclassifiable/Attainment | |||
| Toole County | Unclassifiable/Attainment | |||
| Treasure County | Unclassifiable/Attainment | |||
| Valley County | Unclassifiable/Attainment | |||
| Wheatland County | Unclassifiable/Attainment | |||
| Wibaux County | Unclassifiable/Attainment | |||
| Yellowstone County | Unclassifiable/Attainment | |||
| Yellowstone Natl Park | Unclassifiable/Attainment | |||
a Includes Indian Country located in each county or area, except as otherwise specified.
1 This date is June 15, 2004, unless otherwise noted.
Montana-2008 8-Hour Ozone NAAQS
[Primary and Secondary]
| Designated area | Designation | Classification | ||
| Date1 | Type | Date1 | Type | |
| Statewide and Any Areas of Indian Country | Unclassifiable/Attainment | |||
1 This date is July 20, 2012, unless otherwise noted.
Montana-2015 8-Hour Ozone NAAQS
[Primary and Secondary]
| Designated area1 | Designation | Classification | ||
| Date2 | Type | Date | Type | |
| Beaverhead County | Attainment/Unclassifiable. | |||
| Big Horn County | Attainment/Unclassifiable. | |||
| Blaine County | Attainment/Unclassifiable. | |||
| Broadwater County | Attainment/Unclassifiable. | |||
| Carbon County | Attainment/Unclassifiable. | |||
| Carter County | Attainment/Unclassifiable. | |||
| Cascade County | Attainment/Unclassifiable. | |||
| Chouteau County | Attainment/Unclassifiable. | |||
| Custer County | Attainment/Unclassifiable. | |||
| Daniels County | Attainment/Unclassifiable. | |||
| Dawson County | Attainment/Unclassifiable. | |||
| Deer Lodge County | Attainment/Unclassifiable. | |||
| Fallon County | Attainment/Unclassifiable. | |||
| Fergus County | Attainment/Unclassifiable. | |||
| Flathead County | Attainment/Unclassifiable. | |||
| Gallatin County | Attainment/Unclassifiable. | |||
| Garfield County | Attainment/Unclassifiable. | |||
| Glacier County | Attainment/Unclassifiable. | |||
| Golden Valley County | Attainment/Unclassifiable. | |||
| Granite County | Attainment/Unclassifiable. | |||
| Hill County | Attainment/Unclassifiable. | |||
| Jefferson County | Attainment/Unclassifiable. | |||
| Judith Basin County | Attainment/Unclassifiable. | |||
| Lake County | Attainment/Unclassifiable. | |||
| Lewis and Clark County | Attainment/Unclassifiable. | |||
| Liberty County | Attainment/Unclassifiable. | |||
| Lincoln County | Attainment/Unclassifiable. | |||
| McCone County | Attainment/Unclassifiable. | |||
| Madison County | Attainment/Unclassifiable. | |||
| Meagher County | Attainment/Unclassifiable. | |||
| Mineral County | Attainment/Unclassifiable. | |||
| Missoula County | Attainment/Unclassifiable. | |||
| Musselshell County | Attainment/Unclassifiable. | |||
| Park County | Attainment/Unclassifiable. | |||
| Petroleum County | Attainment/Unclassifiable. | |||
| Phillips County | Attainment/Unclassifiable. | |||
| Pondera County | Attainment/Unclassifiable. | |||
| Powder River County | Attainment/Unclassifiable. | |||
| Powell County | Attainment/Unclassifiable. | |||
| Prairie County | Attainment/Unclassifiable. | |||
| Ravalli County | Attainment/Unclassifiable. | |||
| Richland County | Attainment/Unclassifiable. | |||
| Roosevelt County | Attainment/Unclassifiable. | |||
| Rosebud County | Attainment/Unclassifiable. | |||
| Sanders County | Attainment/Unclassifiable. | |||
| Sheridan County | Attainment/Unclassifiable. | |||
| Silver Bow County | Attainment/Unclassifiable. | |||
| Stillwater County | Attainment/Unclassifiable. | |||
| Sweet Grass County | Attainment/Unclassifiable. | |||
| Teton County | Attainment/Unclassifiable. | |||
| Toole County | Attainment/Unclassifiable. | |||
| Treasure County | Attainment/Unclassifiable. | |||
| Valley County | Attainment/Unclassifiable. | |||
| Wheatland County | Attainment/Unclassifiable. | |||
| Wibaux County | Attainment/Unclassifiable. | |||
| Yellowstone County | Attainment/Unclassifiable. | |||
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 January 16, 2018, unless otherwise noted.
Montana-2008 Lead NAAQS
| Designated area | Designation for the 2008 NAAQSa | |
| Date1 | Type | |
| Whole 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. §81.327
For FEDERAL REGISTER citations affecting §81.327, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.