40 CFR 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 Intrastate	II	III	III	III	III	Bluegrass Intrastate	II	III	III	III	III	Evansville (Indiana)-Owensboro-Henderson (Kentucky) Interstate	I	II	III	III	III	Huntington (West Virginia)-Ashland (Kentucky)-Portsmouth-Ironton (Ohio) Interstate	I	III	III	III	III	Louisville Interstate	I	I	III	III	I	Metropolitan Cincinnati Interstate	I	II	III	III	I	North Central Kentucky Intrastate	II	III	III	III	III	Paducah (Kentucky)-Cairo (Illinois) Interstate	I	II	III	III	III	South Central Kentucky Intrastate	III	III	III	III	III

[37 FR 10868, May 31, 1972, as amended at 39 FR 16346, May 8, 1974]