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

As of April 06, 2015
The 1997 Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).

  Number of    Attainment
Classification Areas  Counties 2010
Population
 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   177   98,821,847
 

   GRAND TOTAL:   35  177  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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