Classification of regions.

§ 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 IntrastateIIIIIIIIIIIII
Evansville (Indiana)-Owensboro-Henderson (Kentucky) InterstateIIIIIIIIIIII
Louisville InterstateIIIIIIIII
Metropolitan Chicago Interstate (Indiana-Illinois)IIIII
Metropolitan Cincinnati InterstateIIIIIIIIII
Metropolitan Indianapolis IntrastateIIIII
Northeast Indiana IntrastateIIIIIIIIIIIIII
South Bend-Elkhart (Indiana)-Benton Harbor (Michigan) InterstateIIAIIIIIIIII
Southern Indiana IntrastateIAIAIIIIIIIII
Wabash Valley IntrastateIIIIIIIIIII
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