8-Hour Ozone Maintenance Area Summary

As of March 30, 2012
Populations are based on the 2010 census

	Number of

Classification	Areas	Counties	Population

Moderate	5	21	5,257,459
Marginal	9	40	8,884,415

SUBTOTAL:	14	61	14,141,874

Former Subpart 1	56	136	22,506,809

SUBTOTAL:	56	136	22,506,809


GRAND TOTAL:	70	197	36,648,683

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). 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

8-Hour Ozone Maintenance Area Summary

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