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8-Hour Ozone (2015) Nonattainment Area Summary

Data is current as of April 30, 2022


Classification Number of Areas Number of Counties 2010 Population
Extreme 2 12 19,544,668
Severe 15 3 1 4,369,276
Serious 5 8 3,239,296
Moderate 1 24 20,217,137
Marginal 37 157 78,098,070
Marginal (Rural Transport) 1 1 0
SUBTOTAL 49 203 125,468,447
 
GRAND TOTAL 49 203 125,468,447

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