Federal regulations · Through 2026-08-25 · Newer source version available

40 CFR 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 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 area 1 Designation
Date 2 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
Date 1 Type Date 1 Type
Hartford-New Britain-Middletown Area:
Hartford County (part) 1/2/1996 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) 1/2/1996 Attainment
Plymouth Town
Middlesex County (part) 1/2/1996 Attainment
Cromwell Town, Durham Town, E. Hampton Town, Haddam Town, Middlefield Town, Middletown City, Portland Town, E. Haddam Town
Tolland County (part) 1/2/1996 Attainment
Andover Town, Bolton Town, Ellington Town, Hebron Town, Somers Town, Tolland Town, and Vernon Town
New Haven—Meriden—Waterbury Area:
Fairfield County (part) 12/4/1998 Attainment
Shelton City
Litchfield County (part) 12/4/1998 Attainment
Bethlehem Town, Thomaston Town, Watertown, Woodbury Town
New Haven County 12/4/1998 Attainment
New York-N. ew Jersey-Long Island Area:
Fairfield County (part) 5/10/1999 Attainment
All cities and townships except Shelton City
Litchfield County (part) 5/10/1999 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
Date 1 Type Date 1 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 12/12/2005 Attainment
Rest of State 11/15/1990 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 10/24/2013 Attainment.
New Haven County 10/24/2013 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 area 1 Designation Classification
Date 2 Type Date 2 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 10/24/2013 Attainment.
New Haven County 10/24/2013 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 Designation a
Date 1 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 Designation a Category/classification
Date 1 Type Date 1 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
Date 1 Type Date 1 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 Connecticut 3
Mohegan Indian Tribe of Connecticut 3
New York-N. New Jersey-Long Island, NY-NJ-CT: 2 Nonattainment 11/7/2022 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 area 1 Designation Classification
Date 2 Type Date 2 Type
Greater Connecticut, CT Nonattainment 7/29/2024 Serious.
Hartford County
Litchfield County
New London County
Tolland County
Windham County
Mashantucket Pequot 5/26/2026 Serious.
Tribal Nation 5/26/2026
Mohegan Indian Tribe
New York-N New Jersey-Long Island, NY-NJ-CT Nonattainment
Fairfield County Serious.
Middlesex County Serious.
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 State Unclassifiable/Attainment.
a Includes Indian Country located in each county or area, except as otherwise specified.
1 December 31, 2011 unless otherwise noted.

Where this section sits in the code

Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER C—AIR PROGRAMS
PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES
Subpart C—Section 107 Attainment Status Designations

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 area 1 Designation

Date 2 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

Date 1 Type Date 1 Type

Hartford-New Britain-Middletown Area:

Hartford County (part) 1/2/1996 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) 1/2/1996 Attainment

Plymouth Town

Middlesex County (part) 1/2/1996 Attainment

Cromwell Town, Durham Town, E. Hampton Town, Haddam Town, Middlefield Town, Middletown City, Portland Town, E. Haddam Town

Tolland County (part) 1/2/1996 Attainment

Andover Town, Bolton Town, Ellington Town, Hebron Town, Somers Town, Tolland Town, and Vernon Town

New Haven—Meriden—Waterbury Area:

Fairfield County (part) 12/4/1998 Attainment

Shelton City

Litchfield County (part) 12/4/1998 Attainment

Bethlehem Town, Thomaston Town, Watertown, Woodbury Town

New Haven County 12/4/1998 Attainment

New York-N. ew Jersey-Long Island Area:

Fairfield County (part) 5/10/1999 Attainment

All cities and townships except Shelton City

Litchfield County (part) 5/10/1999 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

Date 1 Type Date 1 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 12/12/2005 Attainment

Rest of State 11/15/1990 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 10/24/2013 Attainment.

New Haven County 10/24/2013 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 area 1 Designation Classification

Date 2 Type Date 2 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 10/24/2013 Attainment.

New Haven County 10/24/2013 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 Designation a

Date 1 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 Designation a Category/classification

Date 1 Type Date 1 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

Date 1 Type Date 1 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 Connecticut 3

Mohegan Indian Tribe of Connecticut 3

New York-N. New Jersey-Long Island, NY-NJ-CT: 2 Nonattainment 11/7/2022 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 area 1 Designation Classification

Date 2 Type Date 2 Type

Greater Connecticut, CT Nonattainment 7/29/2024 Serious.

Hartford County

Litchfield County

New London County

Tolland County

Windham County

Mashantucket Pequot 5/26/2026 Serious.

Tribal Nation 5/26/2026

Mohegan Indian Tribe

New York-N New Jersey-Long Island, NY-NJ-CT Nonattainment

Fairfield County Serious.

Middlesex County Serious.

New Haven County

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 State Unclassifiable/Attainment.

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

1 December 31, 2011 unless otherwise noted.

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