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8-Hour Ozone (1997) Nonattainment Area Summary
As of December 14, 2012Populations are based on the 2010 census
| Number of | Attainment | |||||||
|---|---|---|---|---|---|---|---|---|
| Classification | Areas | Counties | Population | Date | ||||
| Extreme | 2 | 12 | 19,561,413 | 06/2024 | ||||
| Severe 15 | 4 | 17 | 9,429,685 | 06/2019 | ||||
| Serious | 3 | 16 | 9,707,337 | 06/2013 | ||||
| Moderate | 23 | 145 | 61,174,621 | 06/2010 | ||||
| Marginal | 9 | 37 | 18,373,638 | 06/2007 | ||||
| SUBTOTAL: | 41 | 221 | 118,246,694 | |||||
| GRAND TOTAL: | 41 | 221 | 118,246,694 | |||||
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 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.
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.