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

40 C.F.R. § 52.1221

Classification of regions

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

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxidePhotochemical oxidants (hydrocarbons)
Central Minnesota IntrastateIIIIIIIIIIIIII
Southeast Minnesota-La Crosse (Wisconsin) InterstateIIIaIIIIIIIII
Duluth (Minnesota)-Superior (Wisconsin) InterstateIIIIIIIIIIII
Metropolitan Fargo-Moorhead InterstateIIIIIIIIIIIIII
Minneapolis-St. Paul IntrastateIIIIIIIII
Northwest Minnesota IntrastateIIIIIIIIIIIIII
Southwest Minnesota IntrastateIIIIIIIIIIIIIII
[37 FR 10874, May 31, 1972, as amended at 39 FR 16346, May 8, 1974]