8-Hour Ozone (2015) Nonattainment Area Summary

Data is current as of January 31, 2023

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Classification	Number of Areas	Number of Counties	2010 Population
Extreme	2	12	19,544,668
Severe 15	3	1	4,369,276
Serious	5	8	3,239,296
Moderate	24	147	80,973,080
Marginal	14	34	17,342,127
Marginal (Rural Transport)	1	1	0
SUBTOTAL	49	203	125,468,447
GRAND TOTAL	49	203	125,468,447

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