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 E—Arkansas (§52.170 to §52.200) > 52.171—Classification of regions.

52.171—Classification of regions.

The Arkansas plan was evaluated on the basis of the following classifications:
Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone
Central Arkansas Intrastate II III III III III
Metropolitan Fort Smith Interstate II III III III III
Metropolitan Memphis Interstate I III III III I
Monroe (Louisiana)-El Dorado (Arkansas) Interstate II III III III III
Northeast Arkansas Intrastate III III III III III
Northwest Arkansas Intrastate III III III III III
Shreveport-Texarkana-Tyler Interstate II III III III III

Code of Federal Regulations

[37 FR 10850, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 6571, Jan. 29, 1980]