PM-2.5 (2006) Nonattainment Area Summary

Data is current as of December 31, 2020

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Classification	Number of Areas	Number of Counties	2010 Population
Serious	5	19	21,828,537
Moderate	9	21	9,611,341
SUBTOTAL	14	40	31,439,878
GRAND TOTAL	14	40	31,439,878

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