PM-2.5 (2006) Nonattainment Area Summary

Data is current as of September 30, 2017

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Classification	Number of Areas	Number of Counties	2010 Population
Serious	5	19	21,828,537
Moderate	10	22	9,828,967
SUBTOTAL	15	41	31,657,504
GRAND TOTAL	15	41	31,657,504

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