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PM-10 (1987) Maintenance Area (Redesignated from Nonattainment) Summary

As of September 22, 2016
Classification Number of Areas Number of Counties 2010 Population
Serious 5 15 22,002,469
Moderate 47 52 9,573,185
SUBTOTAL 52 66 31,575,654
GRAND TOTAL 52 66 31,575,654

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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