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8-Hour Ozone Nonattainment Area Summary
As of March 30, 2012Populations are based on the 2010 census
8-Hr Ozone classified area designations for the 1997 standard were effective on June 15, 2004.Thirteen (13) 8-Hr EAC areas were designated attainment on April 15, 2008.
| Number of | Attainment | |||||||
|---|---|---|---|---|---|---|---|---|
| Classification | Areas | Counties | Population | Date | ||||
| Extreme | 2 | 12 | 19,561,413 | 06/2024 | ||||
| Severe 15 | 3 | 15 | 8,561,335 | 06/2019 | ||||
| Serious | 3 | 16 | 9,707,337 | 06/2013 | ||||
| Moderate | 18 | 146 | 65,955,457 | 06/2010 | ||||
| Marginal | 1 | 9 | 6,970,997 | 06/2007 | ||||
| SUBTOTAL: | 27 | 194 | 110,756,539 | |||||
| Former Subpart 1 | 16 | 45 | 18,457,791 | |||||
| SUBTOTAL: | 16 | 45 | 18,457,791 | |||||
| GRAND TOTAL: | 43 | 237 | 129,214,330 | |||||
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 state 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). 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.