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 TT—Utah (§52.2320 to §52.2354) > 52.2321—Classification of regions.

52.2321—Classification of regions.

The Utah 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)
Wasatch Front Intrastate I I I I I
Four Corners Interstate IA IA III III III
Utah Intrastate III III III III III

Code of Federal Regulations

[37 FR 10898, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]