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Connecticut Whole or Part County Nonattainment Status by Year Since 1992 for all Criteria Pollutants

Data is current as of December 31, 2024

Listed by State, County, NAAQS (W=Whole County,P=Partial County designated nonattainment as of report date)
The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.

The 1997 Primary Annual PM-2.5 NAAQS (level of 15 µg/m3) is revoked in attainment and maintenance areas for that NAAQS. For additional information see the PM-2.5 NAAQS SIP Requirements Final Rule, effective October 24, 2016. (81 FR 58009)

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Important Notes Download National Dataset: dbf   |   xls    |   Data dictionary (PDF)
CONNECTICUT
County NAAQS 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Fairfield Co 1-Hour Ozone (1979)-NAAQS revoked P P P P P P P P P P P P P
Fairfield Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W W W W
Fairfield Co 8-Hour Ozone (2008) W W W W W W W W W W W W W
Fairfield Co 8-Hour Ozone (2015) W W W W W W W
Fairfield Co Carbon Monoxide (1971) P P P P P P P
Fairfield Co PM-2.5 (1997) W W W W W W W W
Fairfield Co PM-2.5 (2006) W W W W
Hartford Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W W W W W
Hartford Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W W W W
Hartford Co 8-Hour Ozone (2008) W W W W W W W W W W W W W
Hartford Co 8-Hour Ozone (2015) W W W W W W W
Hartford Co Carbon Monoxide (1971) P P P P
Litchfield Co 1-Hour Ozone (1979)-NAAQS revoked P P P P P P P P P P P P P
Litchfield Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W W W W
Litchfield Co 8-Hour Ozone (2008) W W W W W W W W W W W W W
Litchfield Co 8-Hour Ozone (2015) W W W W W W W
Litchfield Co Carbon Monoxide (1971) P P P P P P P
Middlesex Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W W W W W
Middlesex Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W W W W
Middlesex Co 8-Hour Ozone (2008) W W W W W W W W W W W W W
Middlesex Co 8-Hour Ozone (2015) W W W W W W W
Middlesex Co Carbon Monoxide (1971) P P P P
New Haven Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W W W W W
New Haven Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W W W W
New Haven Co 8-Hour Ozone (2008) W W W W W W W W W W W W W
New Haven Co 8-Hour Ozone (2015) W W W W W W W
New Haven Co Carbon Monoxide (1971) W W W W W W
New Haven Co PM-2.5 (1997) W W W W W W W W
New Haven Co PM-2.5 (2006) W W W W
New London Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W W W W W
New London Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W W W W
New London Co 8-Hour Ozone (2008) W W W W W W W W W W W W W
New London Co 8-Hour Ozone (2015) W W W W W W W
Tolland Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W W W W W
Tolland Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W W W W
Tolland Co 8-Hour Ozone (2008) W W W W W W W W W W W W W
Tolland Co 8-Hour Ozone (2015) W W W W W W W
Tolland Co Carbon Monoxide (1971) P P P P
Windham Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W W W W W
Windham Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W W W W
Windham Co 8-Hour Ozone (2008) W W W W W W W W W W W W W
Windham Co 8-Hour Ozone (2015) W W W W W W W
Important Notes

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