40 C.F.R. § 81.307
Connecticut-TSP
| Designated area | Does not meet primary standards | Does not meet secondary standards | Cannot be classified | Better than national standards |
| AQCR 41 | X | |||
| AQCR 42 | X | |||
| AQCR 43 | X | |||
| AQCR 44 | X |
Connecticut-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 |
| AQCR 41 | X | |||
| AQCR 42 | X | |||
| AQCR 43 | X | |||
| AQCR 44 | X |
Connecticut-2010 Sulfur Dioxide NAAQS
[Primary]
| Designated area1 | Designation | |
| Date2 | Type | |
| State of Connecticut | 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.
Connecticut-Carbon Monoxide
| Designated area | Designation | Classification | ||
| Date1 | Type | Date1 | Type | |
| Hartford-New Britain-Middletown Area: | ||||
| Hartford County (part) | 1/2/96 | Attainment | ||
| Bristol City, Burlington Town, Avon Town, Bloomfield Town, Canton Town, E. Granby Town, E. Hartford Town, E. Windsor Town, Enfield Town, Farmington Town, Glastonbury Town, Granby Town, Hartford city, Manchester Town, Marlborough Town, Newington Town, Rocky Hill Town, Simsbury Town, S. Windsor Town, Suffield Town, W. Hartford Town, Wethersfield Town, Windsor Town, Windsor Locks Town, Berlin Town, New Britain city, Plainville Town, and Southington Town | ||||
| Litchfield County (part) | 1/2/96 | Attainment | ||
| Plymouth Town | ||||
| Middlesex County (part) | 1/2/96 | Attainment | ||
| Cromwell Town, Durham Town, E. Hampton Town, Haddam Town, Middlefield Town, Middletown City, Portland Town, E. Haddam Town | ||||
| Tolland County (part) | 1/2/96 | Attainment | ||
| Andover Town, Bolton Town, Ellington Town, Hebron Town, Somers Town, Tolland Town, and Vernon Town | ||||
| New Haven-Meriden-Waterbury Area: | ||||
| Fairfield County (part) | 12/4/98 | Attainment | ||
| Shelton City | ||||
| Litchfield County (part) | 12/4/98 | Attainment | ||
| Bethlehem Town, Thomaston Town, Watertown, Woodbury Town | ||||
| New Haven County | 12/4/98 | Attainment | ||
| New York-N. ew Jersey-Long Island Area: | ||||
| Fairfield County (part) | 5/10/99 | Attainment | ||
| All cities and townships except Shelton City | ||||
| Litchfield County (part) | 5/10/99 | Attainment | ||
| Bridgewater Town, New Milford Town | ||||
| AQCR 041 Eastern Connecticut Intrastate | Unclassifiable/Attainment | |||
| Middlesex County (part) | ||||
| All portions except cities and towns in Hartford Area | ||||
| New London County | ||||
| Tolland County (part) | ||||
| All portions except cities and towns in Hartford Area | ||||
| Windham County | ||||
| AQCR 044 Northwestern Connecticut Intrastate | Unclassifiable/Attainment | |||
| Hartford County (part) Hartland Township | ||||
| Litchfield County (part) | ||||
| All portions except cities and towns in Hartford, New Haven, and New York Areas | ||||
1 This date is November 15, 1990, unless otherwise noted.
Connecticut-Ozone (1-Hour Standard)2
| Designated area | Designation | Classification | ||
| Date1 | Type | Date1 | Type | |
| Greater Connecticut Area: | ||||
| Fairfield County (part) | Nonattainment | Serious. | ||
| Shelton City | ||||
| Hartford County | Nonattainment | Serious. | ||
| Litchfield County (part) | Nonattainment | Serious. | ||
| all cities and townships except: Bridgewater Town, New Milford Town | ||||
| Middlesex County | Nonattainment | Serious. | ||
| New Haven County | Nonattainment | Serious. | ||
| New London County | Nonattainment | Serious. | ||
| Tolland County | Nonattainment | Serious. | ||
| Windham County | Nonattainment | Serious. | ||
| New York-N. New Jersey-Long Island Area: | ||||
| Fairfield County (part) | Nonattainment | Severe-17. | ||
| all cities and towns except Shelton City | ||||
| Litchfield County (part) | Nonattainment | Severe-17. | ||
| Bridgewater Town, New Milford Town | ||||
1 This date is November 15, 1990, unless otherwise noted.
2 The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in Connecticut.
Connecticut-PM-10
| Designated Area | Designation | Classification | ||
| Date | Type | Date | Type | |
| New Haven County | ||||
| City of New Haven | 12/12/05 | Attainment | ||
| Rest of State | 11/15/90 | Unclassifiable | ||
Connecticut-1997 Annual PM2.5 NAAQS
[Primary and Secondary]
| Designated area | Designationa | Classification | ||
| Date1 | Type | Date | Type | |
| New York-N. New Jersey-Long Island, NY-NJ-CT: | ||||
| Fairfield County | 10/24/13 | Attainment. | ||
| New Haven County | 10/24/13 | Attainment. | ||
| Rest of State: | ||||
| Hartford County | Unclassifiable/Attainment. | |||
| Litchfield County | Unclassifiable/Attainment. | |||
| Middlesex County | Unclassifiable/Attainment. | |||
| New London County | Unclassifiable/Attainment. | |||
| Tolland County | Unclassifiable/Attainment. | |||
| Windham 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.
Connecticut-2012 Annual PM2.5 NAAQS
[Primary]
| Designated area1 | Designation | Classification | ||
| Date2 | Type | Date2 | Type | |
| Statewide: | ||||
| Fairfield County | Unclassifiable/Attainment | |||
| Hartford County | Unclassifiable/Attainment | |||
| Litchfield County | Unclassifiable/Attainment | |||
| Middlesex County | Unclassifiable/Attainment | |||
| New Haven County | Unclassifiable/Attainment | |||
| New London County | Unclassifiable/Attainment | |||
| Tolland County | Unclassifiable/Attainment | |||
| Windham 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.
Connecticut-1997 24-Hour PM2.5 NAAQS
[Primary and Secondary]
| Designated area | Designationa | Classification | ||
| Date1 | Type | Date | Type | |
| New York-N. New Jersey-Long Island, NY-NJ-CT: | ||||
| Fairfield County | Unclassifiable/Attainment | |||
| New Haven County | Unclassifiable/Attainment | |||
| Rest of State: | ||||
| Hartford County | Unclassifiable/Attainment | |||
| Litchfield County | Unclassifiable/Attainment | |||
| Middlesex County | Unclassifiable/Attainment | |||
| New London County | Unclassifiable/Attainment | |||
| Tolland County | Unclassifiable/Attainment | |||
| Windham 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
Connecticut-2006 24-Hour PM2.5 NAAQS
[Primary and Secondary]
| Designated area | Designationa | Classification | ||
| Date1 | Type | Date | Type | |
| New York-N. New Jersey-Long Island, NY-NJ-CT: | ||||
| Fairfield County | 10/24/13 | Attainment. | ||
| New Haven County | 10/24/13 | Attainment. | ||
| Rest of State: | ||||
| Hartford County | Unclassifiable/Attainment | |||
| Litchfield County | Unclassifiable/Attainment | |||
| Middlesex County | Unclassifiable/Attainment | |||
| New London County | Unclassifiable/Attainment | |||
| Tolland County | Unclassifiable/Attainment | |||
| Windham 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.
Connecticut-NO2 (1971 Annual Standard)
| Designated area | Does not meet primary standards | Cannot be classified or better than national standards |
| AQCR 41 | X | |
| AQCR 42 | X | |
| AQCR 43 | X | |
| AQCR 44 | X |
Connecticut-NO2 (2010 1-Hour Standard)
| Designated area | Designationa | |
| Date1 | Type | |
| State of Connecticut | 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.
Connecticut-1997 8-Hour Ozone NAAQS
[Primary and Secondary]
| Designated area | Designationa | Category/classification | ||
| Date1 | Type | Date1 | Type | |
| Greater Connecticut, CT: | ||||
| Hartford County | Nonattainment | Subpart 2/Moderate. | ||
| Litchfield County | Nonattainment | Subpart 2/Moderate. | ||
| New London County | Nonattainment | Subpart 2/Moderate. | ||
| Tolland County | Nonattainment | Subpart 2/Moderate. | ||
| Windham County | Nonattainment | Subpart 2/Moderate. | ||
| New York-N. New Jersey-Long Island, NY-NJ-CT: | ||||
| Fairfield County | Nonattainment | Subpart 2/Moderate. | ||
| Middlesex County | Nonattainment | Subpart 2/Moderate. | ||
| New Haven County | Nonattainment | Subpart 2/Moderate. | ||
a Includes Indian Country located in each county or area, except as otherwise specified.
1 This date is June 15, 2004, unless otherwise noted.
Connecticut-2008 8-Hour Ozone NAAQS
[Primary and Secondary]
| Designated area | Designation | Classification | ||
| Date1 | Type | Date1 | Type | |
| Greater Connecticut, CT:2 | Nonattainment | 9/23/2019 | Serious. | |
| Hartford County | ||||
| Litchfield County | ||||
| New London County | ||||
| Tolland County | ||||
| Windham County | ||||
| Mashantucket Pequot Tribe of Connecticut3 | ||||
| Mohegan Indian Tribe of Connecticut3 | ||||
| New York-N. New Jersey-Long Island, NY-NJ-CT:2 | Nonattainment | 11/7/22 | Severe. | |
| Fairfield County | ||||
| Middlesex County | ||||
| New Haven County | ||||
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.
Connecticut-2015 8-Hour Ozone NAAQS
[Primary and Secondary]
| Designated area1 | Designation | Classification | ||
| Date2 | Type | Date2 | Type | |
| Greater Connecticut | Nonattainment | 7/29/24 | Serious. | |
| Litchfield County. | ||||
| Hartford County. | ||||
| Tolland County. | ||||
| Windham County. | ||||
| New London County. | ||||
| New York-Northern New Jersey-Long Island, NY-NJ-CT | Nonattainment | 7/25/24 | Serious. | |
| Fairfield County. | ||||
| Middlesex County. | ||||
| New Haven County. | ||||
| Mashantucket Pequot Tribal Nation | Nonattainment | 8/3/18 | Moderate. | |
| Mohegan Indian Tribe | Nonattainment | 8/3/18 | Moderate. | |
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 August 3, 2018, unless otherwise noted.
Connecticut-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. §81.307
For FEDERAL REGISTER citations affecting § 81.307, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.