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District Of Columbia Whole or Part County Nonattainment Status by Year Since 1992 for all Criteria Pollutants

Data is current as of September 30, 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The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.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)
DISTRICT OF COLUMBIA
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
District of Columbia 8-Hour Ozone (2015) W W W W W W W
Entire District 1-Hour Ozone (1979)-NAAQS revoked W W W W W W W W W W W W W
Entire District 8-Hour Ozone (1997)-NAAQS revoked W W W W W W W W W W W W
Entire District 8-Hour Ozone (2008) W W W W W W W
Entire District Carbon Monoxide (1971) W W W W
Entire District PM-2.5 (1997) W W W W W W W W W
Important Notes

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