C.F.R. » Title 40 » CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY › SUBCHAPTER C—AIR PROGRAMS › PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS › Subpart QQ—South Dakota

40 C.F.R. § 52.2171

Classification of regions

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The South Dakota plan evaluated on the basis of the following classifications:

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxidePhotochemical oxidants (hydrocarbons)
Metropolitan Sioux City InterstateIIIIIIIIIIIIIII
Metropolitan Sioux Falls InterstateIIIIIIIIIIIIII
Black Hills—Rapid City IntrastateIIIIIIIIIIIIIII
South Dakota IntrastateIIIIIIIIIIIIIII
[37 FR 10893, May 31, 1972]