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8-Hr Ozone (1997) Maintenance Area Summary

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The 1997 Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).

  Number of 
Classification Areas  Counties 2010
Population

Severe 17  1  1  2,844
Moderate  12  79  29,882,496
Marginal  11  43  14,651,861
 
   SUBTOTAL:   24   123   44,537,201
 
Former Subpart 1  56  136  22,506,809
 
   SUBTOTAL:   56   136   22,506,809
 

   GRAND TOTAL:   80  259  67,044,010

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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