8-Hour Ozone (2008) Nonattainment Area Summary

Data is current as of July 31, 2021

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Classification	Number of Areas	Number of Counties	2010 Population
Extreme	2	12	19,561,850
Severe 15	5	7	6,725,618
Serious	9	69	47,434,823
Moderate	5	10	6,707,941
Marginal	14	46	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 across groupings. Multi-state nonattainment areas are not considered maintenance areas until all states in the area have been redesignated