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8-Hour Ozone (2008) Nonattainment Area Summary

Data is current as of September 30, 2019


Classification Number of Areas Number of Counties 2010 Population
Extreme 2 12 19,561,850
Severe 15 3 9 3,535,243
Serious 10 63 47,295,059
Moderate 8 22 10,153,587
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