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

40 C.F.R. § 52.821

Classification of regions

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The Iowa plan was evaluated on the basis of the following classification:

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxidePhotochemical oxidants (hydrocarbons)
Metropolitan Omaha-Council Bluffs InterstateIIIIIIIIIIII
Metropolitan Sioux Falls InterstateIIIIIIIIIIIIII
Metropolitan Sioux City InterstateIIIIIIIIIIIIIII
Metropolitan Dubuque InterstateIIIIIIIIIIIII
Metropolitan Quad Cities InterstateIIIIIIIIIIIII
Burlington-Keokuk InterstateIIIIIIIIIII
Northwest Iowa IntrastateIIIIIIIIIIIIIII
North Central Iowa IntrastateIAIIIIIIIIIIII
Northeast Iowa IntrastateIIIIIIIIIIIII
Southwest Iowa IntrastateIIIIIIIIIIIIIII
South Central Iowa IntrastateIIIIIIIIIII
Southeast Iowa IntrastateIIIIIIIIIIIIIII
[37 FR 10865, May 31, 1972, as amended at 39 FR 16346, May 8, 1974]