§ 52.1171 Classification of regions.
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Title 40 CFR: Protection of Environment › Chapter I › Part 52 › Subpart X › § 52.1171: § 52.1171 Classification of regions.
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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]
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