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 GG—New Mexico (§52.1620 to §52.1640) > 52.1621—Classification of regions.

52.1621—Classification of regions.

The New Mexico plan was evaluated on the basis of the following classifications:
Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone
Albuquerque-Mid-Rio Grande Intrastate I III III III I
New Mexico Southern Border Intrastate IA IA III III III
El Paso-Las Cruces-Alamogordo Interstate I IA III I I
Four Corners Interstate IA IA III III III
Northeastern Plains Intrastate III III III III III
Pecos-Permian Basin Intrastate III III III III III
Southwestern Mountains-Augustine Plains Intrastate III III III III III
Upper Rio Grande Valley Intrastate III III III III III

Code of Federal Regulations

[37 FR 1081, May 31, 1972, as amended at 39 FR 16347, May 8, 1974; 42 FR 20131, Apr. 18, 1977; 45 FR 24468, Apr. 10, 1980; 45 FR 67347, Oct. 10, 1980; 52 FR 5965, Feb. 27, 1987]