C.F.R. » Title 40 » CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY › SUBCHAPTER C—AIR PROGRAMS › PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS › Subpart X—Michigan

40 C.F.R. § 52.1171

Classification of regions

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

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxideOzone
Metropolitan Detroit-Port Huron IntrastateIIIIIIIIIII
Metropolitan Toledo InterstateIIIIIIIII
South Central Michigan IntrastateIIIIIIIIIIIII
South Bend-Elkhart (Indiana)-Benton Harbor (Michigan) InterstateIIAIIIIIIIII
Central Michigan IntrastateIIIIIIIIIIIIII
Upper Michigan IntrastateIIIIIIIIIIIIIII
[37 FR 10873, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 29801, May 6, 1980]