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

Data is current as of May 31, 2021

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Classification	Number of Areas	Number of Counties	2010 Population
Serious	6	16	22,149,374
Moderate	58	61	11,325,764
SUBTOTAL	64	76	33,475,138
GRAND TOTAL	64	76	33,475,138

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