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8-Hour Ozone (2008) Nonattainment Area Summary

Data is current as of August 31, 2020


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 5 12 6,707,941
Marginal 14 47 19,037,118
SUBTOTAL 35 144 99,467,350
 
GRAND TOTAL 35 144 99,467,350

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