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PM-2.5 (1997) Nonattainment Area Summary

As of September 22, 2016
Classification Number of Areas Number of Counties 2010 Population
Serious 1 8 3,842,165
Moderate 6 25 20,019,686
SUBTOTAL 7 33 23,861,851
GRAND TOTAL 7 33 23,861,851

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

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