Title 40

SECTION 52.1171

52.1171 Classification of regions.

§ 52.1171 Classification of regions.

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

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone
Metropolitan Detroit-Port Huron Intrastate I I III III III
Metropolitan Toledo Interstate I I III III I
South Central Michigan Intrastate II II III III III
South Bend-Elkhart (Indiana)-Benton Harbor (Michigan) Interstate I IA III III III
Central Michigan Intrastate II III III III III
Upper Michigan Intrastate III III III III III
[37 FR 10873, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 29801, May 6, 1980]