8-Hour Ozone (2008) Nonattainment Area Summary

Data is current as of December 31, 2018

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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	3	3	919,351
Moderate	14	81	56,529,295
Marginal	15	62	24,173,334
SUBTOTAL	37	160	104,719,073
GRAND TOTAL	37	160	104,719,073

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