PM-2.5 (2006) Nonattainment Area Summary

Data is current as of September 30, 2021

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Classification	Number of Areas	Number of Counties	2010 Population
Serious	5	19	21,828,537
Moderate	8	19	9,486,143
SUBTOTAL	13	38	31,314,680
Former Subpart 1	0	0	0
SUBTOTAL	0	0	0
GRAND TOTAL	13	38	31,314,680

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