CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS > SUBPART Y—Minnesota (§52.1219 to §52.1241) > 52.1221—Classification of regions.

52.1221—Classification of regions.

The Minnesota plan was evaluated on the basis of the following classifications:
Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)
Central Minnesota Intrastate II III III III III
Southeast Minnesota-La Crosse (Wisconsin) Interstate II Ia III III III
Duluth (Minnesota)-Superior (Wisconsin) Interstate I II III III III
Metropolitan Fargo-Moorhead Interstate II III III III III
Minneapolis-St. Paul Intrastate I I III I III
Northwest Minnesota Intrastate II III III III III
Southwest Minnesota Intrastate III III III III III

Code of Federal Regulations

[37 FR 10874, May 31, 1972, as amended at 39 FR 16346, May 8, 1974]