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

Data is current as of February 28, 2025

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The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.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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COLORADO
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 25
Adams Co 1-Hour Ozone (1979)-NAAQS revoked P P P P P P P P P
Adams Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W
Adams Co 8-Hour Ozone (2008) W W W W W W W W W W W W W W
Adams Co 8-Hour Ozone (2015) W W W W W W W W
Adams Co Carbon Monoxide (1971) P P P P P P P P P P
Adams Co PM-10 (1987) P P P P P P P P P P
Arapahoe Co 1-Hour Ozone (1979)-NAAQS revoked P P P P P P P P P
Arapahoe Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W
Arapahoe Co 8-Hour Ozone (2008) W W W W W W W W W W W W W W
Arapahoe Co 8-Hour Ozone (2015) W W W W W W W W
Arapahoe Co Carbon Monoxide (1971) P P P P P P P P P P
Arapahoe Co PM-10 (1987) P P P P P P P P P P
Archuleta Co PM-10 (1987) P P P P P P P P P
Boulder Co 1-Hour Ozone (1979)-NAAQS revoked P P P P P P P P P
Boulder Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W
Boulder Co 8-Hour Ozone (2008) W W W W W W W W W W W W W W
Boulder Co 8-Hour Ozone (2015) W W W W W W W W
Boulder Co Carbon Monoxide (1971) P P P P P P P P P P
Boulder Co PM-10 (1987) P P P P P P P P P P
Broomfield Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W
Broomfield Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W
Broomfield Co 8-Hour Ozone (2008) W W W W W W W W W W W W W W
Broomfield Co 8-Hour Ozone (2015) W W W W W W W W
Broomfield Co Carbon Monoxide (1971) W W W W W W W W W W
Broomfield Co PM-10 (1987) W W W W W W W W W W
Denver Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W
Denver Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W
Denver Co 8-Hour Ozone (2008) W W W W W W W W W W W W W W
Denver Co 8-Hour Ozone (2015) W W W W W W W W
Denver Co Carbon Monoxide (1971) W W W W W W W W W W
Denver Co PM-10 (1987) W W W W W W W W W W
Douglas Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W
Douglas Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W
Douglas Co 8-Hour Ozone (2008) W W W W W W W W W W W W W W
Douglas Co 8-Hour Ozone (2015) W W W W W W W W
Douglas Co Carbon Monoxide (1971) P P P P P P P P P P
Douglas Co PM-10 (1987) W W W W W W W W W W
El Paso Co Carbon Monoxide (1971) P P P P P P P
Fremont Co PM-10 (1987) P P P P P P P P
Jefferson Co 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W
Jefferson Co 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W
Jefferson Co 8-Hour Ozone (2008) W W W W W W W W W W W W W W
Jefferson Co 8-Hour Ozone (2015) W W W W W W W W
Jefferson Co Carbon Monoxide (1971) P P P P P P P P P P
Jefferson Co PM-10 (1987) W W W W W W W W W W
Larimer Co 8-Hour Ozone (1997)-NAAQS revoked P P P P P P P P P
Larimer Co 8-Hour Ozone (2008) P P P P P P P P P P P P P P
Larimer Co 8-Hour Ozone (2015) P P P P P P P P
Larimer Co Carbon Monoxide (1971) P P P P P P P P P P P
Pitkin Co PM-10 (1987) P P P P P P P P P P P
Prowers Co PM-10 (1987) P P P P P P P P P P P P P
Routt Co PM-10 (1987) P P P P P P P P P P
San Miguel Co PM-10 (1987) P P P P P P P P P
Teller Co Carbon Monoxide (1971) P P P P P P P
Weld Co 8-Hour Ozone (1997)-NAAQS revoked P P P P P P P P P
Weld Co 8-Hour Ozone (2008) P P P P P P P P P P P P P P
Weld Co 8-Hour Ozone (2015) W W W W W W W W
Weld Co Carbon Monoxide (1971) P P P P P P P
Important Notes

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