40 CFR 52.1871 - Classification of regions.

Regulations last checked for updates: May 04, 2025

Title 40 - Protection of Environment last revised: Nov 04, 2025

§ 52.1871 - Classification of regions.

The Ohio plan was evaluated on the basis of the following classifications:

Air quality control region	Pollutant
Air quality control region	Particulate matter	Sulfur oxides	Nitrogen dioxide	Carbon monoxide	Ozone
Greater Metropolitan Cleveland Intrastate	I	I	III	III	I
Huntington (West Virginia)-Ashland (Kentucky)-Portsmouth-Ironton (Ohio) Interstate	I	III	III	III	III
Mansfield-Marion Intrastate	II	II	III	III	III
Metropolitan Cincinnati Interstate	I	II	III	III	I
Metropolitan Columbus Intrastate	I	III	III	III	I
Metropolitan Dayton Intrastate	I	II	III	III	I
Metropolitan Toledo Interstate	I	I	III	III	I
Northwest Ohio Intrastate	II	I	III	III	III
Northwest Pennsylvania-Youngstown Interstate	I	II	III	III	III
Parkersburg (West Virginia)-Marietta (Ohio) Interstate	I	II	III	III	III
Sandusky Intrastate	III	III	III	III	III
Steubenville-Weirton-Wheeling Interstate	I	I	III	III	III
Wilmington-Chillicothe-Logan Intrastate	III	III	III	III	III
Zanesville-Cambridge Intrastate	II	IA	III	III	III

[37 FR 10886, May 31, 1972, as amended at 39 FR 16347, May 8, 1974; 45 FR 72146, Oct. 31, 1980]

authority: 42 U.S.C. 7401

cite as: 40 CFR 52.1871