8-Hour Ozone (1997) Maintenance Area Summary

As of December 14, 2012
Populations are based on the 2010 census

	Number of

Classification	Areas	Counties	Population

Moderate	7	37	16,225,095
Marginal	9	40	8,884,415

SUBTOTAL:	16	77	25,109,510

Former Subpart 1	56	136	22,506,809

SUBTOTAL:	56	136	22,506,809


GRAND TOTAL:	72	213	47,616,319

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.

8-Hour Ozone (1997) Maintenance Area Summary

Local Navigation