Environmental

The Clean Air Act's 'Class I' air quality areas include certain Wyoming locations such as:

ACasper and Cheyenne city centers
BYellowstone National Park and certain wilderness areas requiring the highest air quality protection✓ Correct
CAll of Wyoming's BLM lands
DAgricultural areas with pesticide use

Explanation

The Clean Air Act designates Class I air quality areas (including national parks and certain wilderness areas) that receive the most stringent air quality protections. Yellowstone NP and some Wyoming wilderness areas are Class I areas.

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