Regulations last checked for updates: May 03, 2025

Title 40 - Protection of Environment last revised: Nov 03, 2025
All TitlesTitle 40Chapter IPart 52Subpart S - Subpart S—Kentucky
View all text of Subpart S [§ 52.919 - § 52.941]
§ 52.921 - Classification of regions.

The Kentucky plan was evaluated on the basis of the following classifications:

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)
Appalachian IntrastateIIIIIIIIIIIIII
Bluegrass IntrastateIIIIIIIIIIIIII
Evansville (Indiana)-Owensboro-Henderson (Kentucky) InterstateIIIIIIIIIIII
Huntington (West Virginia)-Ashland (Kentucky)-Portsmouth-Ironton (Ohio) InterstateIIIIIIIIIIIII
Louisville InterstateIIIIIIIII
Metropolitan Cincinnati InterstateIIIIIIIIII
North Central Kentucky IntrastateIIIIIIIIIIIIII
Paducah (Kentucky)-Cairo (Illinois) InterstateIIIIIIIIIIII
South Central Kentucky IntrastateIIIIIIIIIIIIIII
[37 FR 10868, May 31, 1972, as amended at 39 FR 16346, May 8, 1974]
authority: 42 U.S.C. 7401
cite as: 40 CFR 52.921
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