8-Hour Ozone (2008) Nonattainment Area Summary

Data is current as of January 31, 2023

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Classification	Number of Areas	Number of Counties	2010 Population
Extreme	2	12	19,561,850
Severe 15	10	58	42,446,219
Serious	3	7	2,534,484
Moderate	5	10	6,707,941
Marginal	14	46	19,037,118
SUBTOTAL	34	133	90,287,612
GRAND TOTAL	34	133	90,287,612

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