Nonattainment and Maintenance Areas in the U. S.
8-hour Ozone Standard

Nonattainment Areas (303 entire counties)
Nonattainment Areas (34 partial counties)
Maintenance Areas (137 entire or partial counties)

03/2008

Partial counties, those with part of the county designated
nonattainment and part attainment, are shown as full counties on the map.

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