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8-Hour Ozone Area Summary
(1997 Standard)

As of July 31, 2009
8-Hr Ozone classified area designations for the 1997 standard are effective on June 15, 2004. Thirteen (13) 8-Hr EAC areas were designated attainment on April 15, 2008.

  Number of   Attainment
Category/Classification Areas  Counties   Population   Date
Severe 17 1   4   14,593,587   06/2021
Severe-15 1   8   4,669,571   06/2019
Serious 4   16   6,247,662   06/2013
Moderate 24   179   74,063,906   06/2010
Marginal 1   9   6,541,828   06/2007
 
   SUBTOTAL: 31   212   106,116,554    
 
Former Subpart 1 23   72   20,715,294   06/2009
 
   SUBTOTAL: 23   72   20,715,294    
 
   GRAND TOTAL: 54   282   126,831,848    
8-hour Ozone counties are also in:
 
  No. of
Counties		   Population  
 
Previous 1-hr Ozone nonattainment areas 169   95,824,751  
 
Previous 1-hr Ozone maintenance areas 65   25,548,739  
 
New 8-hr Ozone counties not presently in previous 1-hr Ozone nonattainment or maintenance areas 48   5,458,358  
TOTAL: 282   126,831,848  
 
8-hr Ozone counties in CO, or PM-10 nonattainment or maintenance areas or previous 1-hr Ozone nonattainment or maintenance areas 250   124,044,140  

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time within groupings. Previous 1-hr Ozone maintenance county counts and population do not include counties that are also in a nonattainment area e.g., Kern Co, CA.

For simplicity, Greensboro, NC, Nashville, TN, and Denver, CO are included in the in the "Previous 1-hr Ozone" nonattainment and maintenance area county and population.

On June 8, 2007, the United States Court of Appeals vacated the Subpart 1 portion of the Phase 1 Rule (Court Order). The Subpart 1 areas in the Greenbook are listed as "Former Subpart 1" until reclassification of the areas is finalized. Proposed reclassifications were published on January 16, 2009 (74 FR 2936).

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