40 CFR 52.771: Classification of regions.

(a) The Indiana plan was evaluated on the basis of the following classifications:

Air quality control region Pollutant

Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)

East Central Indiana Intrastate II II III III III

Evansville (Indiana)-Owensboro-Henderson (Kentucky) Interstate I II III III III

Louisville Interstate I I III III I

Metropolitan Chicago Interstate (Indiana-Illinois) I I I I I

Metropolitan Cincinnati Interstate I II III III I

Metropolitan Indianapolis Intrastate I I I I I

Northeast Indiana Intrastate II III III III III

South Bend-Elkhart (Indiana)-Benton Harbor (Michigan) Interstate I IA III III III

Southern Indiana Intrastate IA IA III III III

Wabash Valley Intrastate I I III III III

(b) The requirements of § 51.150 of this chapter are not met by the classification of counties in APC-22 for the purposes of attainment and maintenance of the total suspended particulate ambient air quality standards.

(c) The requirements of § 51.150 of this chapter are not met by the classification of counties in APC-22 for the purposes of attainment and maintenance of the photochemical oxidant (hydrocarbon) ambient air quality standards.

(d) The requirements of § 51.150 of this chapter are not met by the classification of Jefferson, LaPorte, Porter, Vigo and Warrick Counties in Indiana in Regulation APC-22 for the purposes of attainment and maintenance of the sulfur dioxide ambient air quality standards.