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8-Hour Ozone (1997) Maintenance Area (Redesignated from Nonattainment) Summary - NAAQS Revoked
8-Hour Ozone (1997) Maintenance Area (Redesignated from Nonattainment) Summary - NAAQS Revoked
Data is current as of August 31, 2024The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).
| Classification | Number of Areas | Number of Counties | 2010 Population |
|---|---|---|---|
| Extreme | 0 | 0 | 0 |
| Severe 17 | 1 | 1 | 2,844 |
| Severe 15 | 0 | 0 | 0 |
| Serious | 0 | 0 | 0 |
| Moderate | 12 | 78 | 29,882,382 |
| Marginal | 11 | 43 | 14,651,861 |
| SUBTOTAL | 24 | 122 | 44,537,087 |
| Former Subpart 1 | 56 | 136 | 22,506,809 |
| SUBTOTAL | 56 | 136 | 22,506,809 |
| Moderate EAC | 0 | 0 | 0 |
| Marginal EAC | 0 | 0 | 0 |
| Subpart 1 EAC | 0 | 0 | 0 |
| SUBTOTAL | 0 | 0 | 0 |
| GRAND TOTAL | 80 | 258 | 67,043,896 |
County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time across 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.