40 C.F.R. § 52.2171

Classification of regions.

Last amended: 2016Year: 2026Length: 69 wordsOfficial source

Cite as 40 C.F.R. § 52.2171 (2026)

The South Dakota plan evaluated on the basis of the following classifications: Air quality control region Pollutant Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons) Metropolitan Sioux City Interstate III III III III III Metropolitan Sioux Falls Interstate II III III III III Black Hills—Rapid City Intrastate III III III III III South Dakota Intrastate III III III III III [37 FR 10893, May 31, 1972]
40 C.F.R. § 52.2171: Classification of regions. | Justis AI