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

Data is current as of November 30, 2021
The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).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 3 12 19,983,195 06/2024
Severe 17 1 0 913 06/2021
Severe 15 3 14 9,004,260 06/2019
Serious 3 16 9,707,337 06/2013
Moderate 19 102 47,517,220 06/2010
Marginal 7 32 12,606,192 06/2007
SUBTOTAL 36 176 98,819,117  
 
Former Subpart 1 0 0 0
SUBTOTAL 0 0 0  
 
Moderate EAC 0 0 0
Marginal EAC 0 0 0
Subpart 1 EAC 0 0 0
SUBTOTAL 0 0 0  
 
GRAND TOTAL 36 176 98,819,117  

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time across 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.