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8-Hour Ozone (1997) Nonattainment Area Summary - NAAQS Revoked

As of September 22, 2016
The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).
Classification Number of Areas Number of Counties 2010 Population Attainment
Date
Extreme 2 12 19,560,500 06/2024
Severe 17 1 1 913 06/2021
Severe 15 4 17 9,429,685 06/2019
Serious 3 16 9,707,337 06/2013
Moderate 18 103 47,517,220 06/2010
Marginal 7 34 12,606,192 06/2007
 
SUBTOTAL 35 176 98,821,847  
 
GRAND TOTAL 35 176 98,821,847  

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time within groupings. Multi-state nonattainment areas are not considered maintenance areas until all states in the area have been redesignated

On June 8, 2007, the United States Court of Appeals vacated the Subpart 1 portion of the Phase 1 Rule (Court Order) (PDF). On May 14, 2012, the Former Subpart 1 nonattainment areas were classified under Subpart 2 (77 FR 28424 ) (PDF), effective June 13, 2012.


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