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8-Hour Ozone (1997) Maintenance Area Summary

As of December 05, 2013
Populations are based on the 2010 census

  Number of 
Classification Areas  Counties Population

Moderate  9  42  20,059,110
Marginal  10  41  10,803,234
 
   SUBTOTAL:   19   83   30,862,344
 
Former Subpart 1  56  136  22,506,809
 
   SUBTOTAL:   56   136   22,506,809
 

   GRAND TOTAL:   75  219  53,369,153

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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