PM-2.5 (2006) Nonattainment Area Summary

Data is current as of December 31, 2025

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Classification	Number of Areas	Number of Counties	2010 Population
Serious	3	13	19,645,863
Moderate	5	16	9,430,471
SUBTOTAL	8	29	29,076,334
Former Subpart 1	0	0	0
SUBTOTAL	0	0	0
GRAND TOTAL	8	29	29,076,334

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