40 C.F.R. § 52.1621

Classification of regions

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The New Mexico plan was evaluated on the basis of the following classifications:

Air quality control region	Pollutant
Air quality control region	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

[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]