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Green Book Nonattainment Areas

8-Hour Ozone (1997) Maintenance Areas (Redesignated from Nonattainment) Summary - NAAQS Revoked

As of April 6, 2015
The 8-Hour Ozone (1997) NAAQS was revoked effective April 6, 2015 (80 FR 12264).
Classification Number of Areas Number of 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. On May 14, 2012, the Former Subpart 1 nonattainment areas were classified under Subpart 2 (77 FR 28424 ), effective June 13, 2012.


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