8-Hour Ozone (2008) Nonattainment Area Summary

Data is current as of June 20, 2017

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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	2	2	824,175
Moderate	15	82	56,624,471
Marginal	17	79	28,733,538
SUBTOTAL	39	177	109,279,277
GRAND TOTAL	39	177	109,279,277

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