8-Hour Ozone (2008) Nonattainment Area Summary

Data is current as of March 31, 2020

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Classification	Number of Areas	Number of Counties	2010 Population
Extreme	2	12	19,561,850
Severe 15	3	9	3,535,243
Serious	11	72	50,625,198
Moderate	7	13	6,823,448
Marginal	14	47	19,037,118
SUBTOTAL	37	145	99,582,857
GRAND TOTAL	37	145	99,582,857

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