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8-Hour Ozone Area Summary
As of November 13, 2009
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 | |||||||
|---|---|---|---|---|---|---|---|---|
| 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 | 23 | 171 | 71,118,075 | 06/2010 | ||||
| Marginal | 1 | 9 | 6,541,828 | 06/2007 | ||||
| SUBTOTAL: | 30 | 204 | 103,170,723 | |||||
| Former Subpart 1 | 22 | 66 | 19,173,364 | 06/2009 | ||||
| SUBTOTAL: | 22 | 66 | 19,173,364 | |||||
| GRAND TOTAL: | 52 | 268 | 122,344,087 | |||||
| 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 | 54 | 21,278,450 | ||||||
| New 8-hr Ozone counties not presently in previous 1-hr Ozone nonattainment or maintenance areas | 45 | 5,240,886 | ||||||
| TOTAL: | 268 | 122,344,087 | ||||||
| 8-hr Ozone counties in CO, or PM-10 nonattainment or maintenance areas or previous 1-hr Ozone nonattainment or maintenance areas | 238 | 119,651,092 | ||||||
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).