8-Hour Ozone (2015) Nonattainment Area Summary with History

Data is current as of March 31, 2023

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	NUMBER OF AREAS				NUMBER OF COUNTIES				2010 POPULATION
Classif.	Original 2018 Baseline	Adjusted Baseline*	Today	Redesig	Original 2018 Baseline	Adjusted Baseline*	Today	Redesig	Original 2018 Baseline	Adjusted Baseline*	Today	Redesig
Extreme	2	2	2	0	12	12	12	0	19,544,668	19,544,668	19,544,668	0
Severe 15	2	3	3	0	0	1	1	0	1,291,989	4,369,276	4,369,276	0
Serious	2	5	5	0	1	8	8	0	821,740	3,239,296	3,239,296	0
Moderate	5	25	25	0	32	154	154	0	25,711,980	85,677,823	85,677,823	0
Marginal	38	15	12	3	153	32	20	12	74,984,197	14,344,283	8,968,008	5,376,275
Marginal (Rural Transport)	2	3	1	2	2	2	1	1	31	17,035	0	17,035
SUBTOTAL	51	53	48	5	200	209	196	13	122,354,605	127,192,381	121,799,071	5,393,310
GRAND TOTAL	51	53	48	5	200	209	196	13	122,354,605	127,192,381	121,799,071	5,393,310

* 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 2018 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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