Green Book Nonattainment Areas
8-Hour Ozone (1997) Maintenance Areas (Redesignated from Nonattainment) Summary - NAAQS RevokedAs of April 6, 2015
The 8-Hour Ozone (1997) NAAQS was revoked effective April 6, 2015 (80 FR 12264).
|Classification||Number of Areas||Number of Counties||2010 Population|
|Former Subpart 1||56||136||22,506,809|
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. On May 14, 2012, the Former Subpart 1 nonattainment areas were classified under Subpart 2 (77 FR 28424 ), effective June 13, 2012.