40 CFR § 52.721
Classification of regions
June 9, 2020
The Illinois plan was evaluated on the basis of the following classifications:
Open Table
| Air quality control region | Pollutant | ||||
|---|---|---|---|---|---|
| Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Ozone | |
| Burlington-Keokuk Interstate | I | I | III | III | III |
| East Central Illinois Intrastate | III | II | III | III | III |
| Metropolitan Chicago Interstate (Indiana-Illinois) | I | I | I | I | I |
| Metropolitan Dubuque Interstate | I | III | III | III | III |
| Metropolitan Quad Cities Interstate | I | III | III | III | III |
| Metropolitan St. Louis Interstate (Missouri-Illinois) | I | I | III | I | I |
| North Central Illinois Intrastate | II | IA | III | III | III |
| Paducah (Kentucky)-Cairo (Illinois) Interstate | I | II | III | III | III |
| Rockford (Illinois)-Janesville-Beloit (Wisconsin) Interstate | II | III | III | III | III |
| Southeast Illinois Intrastate | III | II | III | III | III |
| West Central Illinois Intrastate | I | IA | III | III | III |
[37 FR 10862, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 11493, Feb. 21, 1980]
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