Classification of regions.

§ 52.721 Classification of regions.

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

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone
Burlington-Keokuk InterstateIIIIIIIIIII
East Central Illinois IntrastateIIIIIIIIIIIIII
Metropolitan Chicago Interstate (Indiana-Illinois)IIIII
Metropolitan Dubuque InterstateIIIIIIIIIIIII
Metropolitan Quad Cities InterstateIIIIIIIIIIIII
Metropolitan St. Louis Interstate (Missouri-Illinois)IIIIIII
North Central Illinois IntrastateIIIAIIIIIIIII
Paducah (Kentucky)-Cairo (Illinois) InterstateIIIIIIIIIIII
Rockford (Illinois)-Janesville-Beloit (Wisconsin) InterstateIIIIIIIIIIIIII
Southeast Illinois IntrastateIIIIIIIIIIIIII
West Central Illinois IntrastateIIAIIIIIIIII
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