§ 52.2171 - Classification of regions.  


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  • § 52.2171 Classification of regions.

    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]