Regulations last checked for updates: May 19, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 52Subpart Q - Subpart Q—Iowa
View all text of Subpart Q [§ 52.820 - § 52.842]
§ 52.821 - Classification of regions.

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

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical 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]
authority: 42 U.S.C. 7401
cite as: 40 CFR 52.821
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