8-Hr Ozone (1997) Nonattainment Area Summary (NAAQS Revoked)As of April 06, 2015
The 1997 Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).
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) (PDF). On May 14, 2012, the Former Subpart 1 nonattainment areas were classified under Subpart 2 (77 FR 28424 ) (PDF), effective June 13, 2012.