PM-2.5 (2006) Nonattainment Area Summary

Data is current as of June 30, 2025

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Classification	Number of Areas	Number of Counties	2010 Population
Serious	5	19	21,828,537
Moderate	6	17	9,451,260
SUBTOTAL	11	36	31,279,797
Former Subpart 1	0	0	0
SUBTOTAL	0	0	0
GRAND TOTAL	11	36	31,279,797

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