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District Of Columbia Nonattainment/Maintenance Status for Each County by Year for All Criteria Pollutants

As of February 13, 2017
Listed by County, NAAQS, Area. The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.

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Important Notes
County NAAQS Area Name Nonattainment in Year Redesignation
to Maintenance
Classification Whole or/
Part County
Population
(2010
)
State/
County
FIPS Codes
DISTRICT OF COLUMBIA
Entire District 1-Hour Ozone (1979)-NAAQS revoked Washington, DC-MD-VA
92 93 94 95 96 97 98 99 00 01 02 03 04                                                    
/ / Severe 15 Whole 601,723 11/001
Entire District 8-Hour Ozone (1997)-NAAQS revoked Washington, DC-MD-VA
                                                04 05 06 07 08 09 10 11 12 13 14            
/ / Moderate Whole 601,723 11/001
Entire District 8-Hour Ozone (2008) Washington, DC-MD-VA
                                                                                12 13 14 15 16 17
/ / Marginal Whole 601,723 11/001
Entire District Carbon Monoxide (1971) Washington, DC-MD-VA
92 93 94 95                                                                                        
03/15/1996 Moderate <= 12.7ppm Whole 601,723 11/001
Entire District PM-2.5 (1997) Washington, DC-MD-VA
                                                    05 06 07 08 09 10 11 12 13                
11/05/2014 Moderate Whole 601,723 11/001
Important Notes

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