8-Hour Ozone (2015) Nonattainment Area Summary

Data is current as of March 31, 2021

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Classification	Number of Areas	Number of Counties	2010 Population
Extreme	2	12	19,544,668
Severe 15	2	3	1,291,989
Serious	2	2	821,740
Moderate	5	33	25,711,980
Marginal	38	154	75,048,694
Marginal (Rural Transport)	1	1	0
SUBTOTAL	50	196	122,419,071
GRAND TOTAL	50	196	122,419,071

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