Classification of regions.

§ 52.671 Classification of regions.

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

Air quality control region Pollutants
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone
Eastern Idaho IntrastateIIIIIIIIIIII.
Eastern Washington Northern Idaho Interstate (Idaho)IIIIIIIIIIII.
Idaho IntrastateIIIIIIIIIIIII.
Metropolitan Boise IntrastateIIIIIIIIIIII.
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