U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 40Chapter IPart 52Subpart E - Subpart E—Arkansas
View all text of Subpart E [§ 52.170 - § 52.200]
§ 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 IntrastateIIIIIIIIIIIIII
Metropolitan Fort Smith InterstateIIIIIIIIIIIIII
Metropolitan Memphis InterstateIIIIIIIIIII
Monroe (Louisiana)-El Dorado (Arkansas) InterstateIIIIIIIIIIIIII
Northeast Arkansas IntrastateIIIIIIIIIIIIIII
Northwest Arkansas IntrastateIIIIIIIIIIIIIII
Shreveport-Texarkana-Tyler InterstateIIIIIIIIIIIIII
[37 FR 10850, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 6571, Jan. 29, 1980]
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