Regulations last checked for updates: May 16, 2024

Title 40 - Protection of Environment last revised: May 14, 2024
All TitlesTitle 40Chapter IPart 81Subpart C - Subpart C—Section 107 Attainment Status Designations
View all text of Subpart C [§ 81.300 - § 81.356]
§ 81.307 - Connecticut.

Connecticut—TSP

Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards
AQCR 41X
AQCR 42X
AQCR 43X
AQCR 44X

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 41X
AQCR 42X
AQCR 43X
AQCR 44X

Connecticut—2010 Sulfur Dioxide NAAQS

[Primary]

Designated area 1 Designation
Date 2 Type
State of ConnecticutAttainment/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
Date 1 Type Date 1 Type
Hartford-New Britain-Middletown Area:
Hartford County (part)1/2/96Attainment
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)1/2/96Attainment
Plymouth Town
Middlesex County (part)1/2/96Attainment
Cromwell Town, Durham Town, E. Hampton Town, Haddam Town, Middlefield Town, Middletown City, Portland Town, E. Haddam Town
Tolland County (part)1/2/96Attainment
Andover Town, Bolton Town, Ellington Town, Hebron Town, Somers Town, Tolland Town, and Vernon Town
New Haven—Meriden—Waterbury Area:
Fairfield County (part)12/4/98Attainment
Shelton City
Litchfield County (part)12/4/98Attainment
Bethlehem Town, Thomaston Town, Watertown, Woodbury Town
New Haven County12/4/98Attainment
New York-N. ew Jersey-Long Island Area:
Fairfield County (part)5/10/99Attainment
All cities and townships except Shelton City
Litchfield County (part)5/10/99Attainment
Bridgewater Town, New Milford Town
AQCR 041 Eastern Connecticut IntrastateUnclassifiable/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 IntrastateUnclassifiable/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
Date 1 Type Date 1 Type
Greater Connecticut Area:
Fairfield County (part)NonattainmentSerious.
Shelton City
Hartford CountyNonattainmentSerious.
Litchfield County (part)NonattainmentSerious.
all cities and townships except: Bridgewater Town, New Milford Town
Middlesex CountyNonattainmentSerious.
New Haven CountyNonattainmentSerious.
New London CountyNonattainmentSerious.
Tolland CountyNonattainmentSerious.
Windham CountyNonattainmentSerious.
New York—N. New Jersey-Long Island Area:
Fairfield County (part)NonattainmentSevere-17.
all cities and towns except Shelton City
Litchfield County (part)NonattainmentSevere-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 Haven12/12/05Attainment
Rest of State11/15/90Unclassifiable

Connecticut—1997 Annual PM2.5 NAAQS

[Primary and Secondary]

Designated area Designation a Classification
Date 1 Type Date Type
New York-N. New Jersey-Long Island, NY-NJ-CT:
Fairfield County10/24/13Attainment.
New Haven County10/24/13Attainment.
Rest of State:
Hartford CountyUnclassifiable/Attainment.
Litchfield CountyUnclassifiable/Attainment.
Middlesex CountyUnclassifiable/Attainment.
New London CountyUnclassifiable/Attainment.
Tolland CountyUnclassifiable/Attainment.
Windham CountyUnclassifiable/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 area 1 Designation Classification
Date 2 Type Date 2 Type
Statewide:
Fairfield CountyUnclassifiable/Attainment
Hartford CountyUnclassifiable/Attainment
Litchfield CountyUnclassifiable/Attainment
Middlesex CountyUnclassifiable/Attainment
New Haven CountyUnclassifiable/Attainment
New London CountyUnclassifiable/Attainment
Tolland CountyUnclassifiable/Attainment
Windham CountyUnclassifiable/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 Designation a Classification
Date 1 Type Date Type
New York-N. New Jersey-Long Island, NY-NJ-CT:
Fairfield CountyUnclassifiable/Attainment
New Haven CountyUnclassifiable/Attainment
Rest of State:
Hartford CountyUnclassifiable/Attainment
Litchfield CountyUnclassifiable/Attainment
Middlesex CountyUnclassifiable/Attainment
New London CountyUnclassifiable/Attainment
Tolland CountyUnclassifiable/Attainment
Windham CountyUnclassifiable/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 Designation a Classification
Date 1 Type Date Type
New York-N. New Jersey-Long Island, NY-NJ-CT:
Fairfield County10/24/13Attainment.
New Haven County10/24/13Attainment.
Rest of State:
Hartford CountyUnclassifiable/Attainment
Litchfield CountyUnclassifiable/Attainment
Middlesex CountyUnclassifiable/Attainment
New London CountyUnclassifiable/Attainment
Tolland CountyUnclassifiable/Attainment
Windham CountyUnclassifiable/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 41X
AQCR 42X
AQCR 43X
AQCR 44X

Connecticut—NO2 (2010 1-Hour Standard)

Designated area Designation a
Date 1 Type
State of ConnecticutUnclassifiable/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 Designation a Category/classification
Date 1 Type Date 1 Type
Greater Connecticut, CT:
Hartford CountyNonattainmentSubpart 2/Moderate.
Litchfield CountyNonattainmentSubpart 2/Moderate.
New London CountyNonattainmentSubpart 2/Moderate.
Tolland CountyNonattainmentSubpart 2/Moderate.
Windham CountyNonattainmentSubpart 2/Moderate.
New York-N. New Jersey-Long Island, NY-NJ-CT:
Fairfield CountyNonattainmentSubpart 2/Moderate.
Middlesex CountyNonattainmentSubpart 2/Moderate.
New Haven CountyNonattainmentSubpart 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
Date 1 Type Date 1 Type
Greater Connecticut, CT: 2Nonattainment9/23/2019Serious.
Hartford County
Litchfield County
New London County
Tolland County
Windham County
Mashantucket Pequot Tribe of Connecticut 3
Mohegan Indian Tribe of Connecticut 3
New York-N. New Jersey-Long Island, NY-NJ-CT: 2Nonattainment11/7/22Severe.
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 area 1 Designation Classification
Date 2 Type Date 2 Type
Greater Connecticut, CTNonattainment11/7/22Moderate.
Hartford County.
Litchfield County.
New London County.
Tolland County.
Windham County.
New York-Northern New Jersey-Long Island, NY-NJ-CTNonattainmentModerate.
Fairfield County.
Middlesex County.
New Haven County.

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 NAAQS a
Date 1 Type
Whole StateUnclassifiable/Attainment.

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

1 December 31, 2011 unless otherwise noted.

[43 FR 8964, Mar. 3, 1978] Editorial Note: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.
authority: 42 U.S.C. 7401,
source: 36 FR 22421, Nov. 25, 1971, unless otherwise noted.
cite as: 40 CFR 81.307
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