8-Hour Ozone (2008) Maintenance Area (Redesignated from Nonattainment) Summary

Data is current as of November 30, 2025

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Classification	Number of Areas	Number of Counties	2010 Population
Extreme	0	0	0
Severe 15	0	0	0
Serious	1	11	9,179,738
Moderate	3	16	4,868,524
Marginal	9	65	18,667,921
SUBTOTAL	13	92	32,716,183
GRAND TOTAL	13	92	32,716,183

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time across groupings. Multi-state nonattainment areas are not considered maintenance areas until all states in the area have been redesignated.