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8-Hr Ozone (1997) Nonattainment Area Summary

As of July 02, 2014

  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  19  112  50,111,458  06/2010
Marginal  8  36  16,454,819  06/2007
 
   SUBTOTAL:   37   188  105,264,712
 

   GRAND TOTAL:   37  188  105,264,712

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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