40 C.F.R. § 52.721

Current through March 31, 2024

Section 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 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

40 C.F.R. §52.721

37 FR 10862, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 11493, Feb. 21, 1980