8-Hour Ozone (2015) Nonattainment Area Summary

Data is current as of March 31, 2024

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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	23	140	79,044,552
Marginal	12	20	8,968,008
Marginal (Rural Transport)	1	1	0
SUBTOTAL	46	182	115,165,800
GRAND TOTAL	46	182	115,165,800

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