8-Hour Ozone (2008) Nonattainment Area Summary with History

Data is current as of February 28, 2025

Original 8-Hour Ozone (2008) areas were designated effective July 20, 2012.

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	NUMBER OF AREAS				NUMBER OF COUNTIES				2010 POPULATION
Classif.	Original 2012 Baseline	Adjusted Baseline*	Today	Redesig	Original 2012 Baseline	Adjusted Baseline*	Today	Redesig	Original 2012 Baseline	Adjusted Baseline*	Today	Redesig
Extreme	2	3	3	0	12	12	12	0	19,561,850	19,987,656	19,987,656	0
Severe 15	3	9	9	0	9	58	58	0	3,535,243	42,020,413	42,020,413	0
Serious	2	4	3	1	2	18	7	11	824,175	11,714,222	2,534,484	9,179,738
Moderate	3	8	5	3	17	26	10	16	8,945,948	11,576,465	6,707,941	4,868,524
Marginal	36	23	14	9	192	111	46	65	90,136,579	37,705,039	19,037,118	18,667,921
SUBTOTAL	46	47	34	13	232	225	133	92	123,003,795	123,003,795	90,287,612	32,716,183
GRAND TOTAL	46	47	34	13	232	225	133	92	123,003,795	123,003,795	90,287,612	32,716,183

* Please Note: Changes can occur that adjust the original baseline counts, e.g., classification changes, area boundary changes, new areas designated nonattainment. See the report listing these adjustments to original 2012 nonattainment areas.

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time across groups.
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