PM-2.5 (1997) Nonattainment Area Summary

Data is current as of March 31, 2024

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Classification	Number of Areas	Number of Counties	2010 Population
Serious	1	8	3,842,165
Moderate	2	5	15,737,124
SUBTOTAL	3	13	19,579,289
Former Subpart 1	0	0	0
SUBTOTAL	0	0	0
GRAND TOTAL	3	13	19,579,289

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time across groupings. Multi-state nonattainment areas are not considered maintenance areas until all states in the area have been redesignated