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

Data is current as of September 30, 2017

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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