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Clean Air Act Amendments (1977)


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US legislation that amended the Clean Air Act (1963) by establishing the national goal of preventing any future reduction of visibility of Class I federal areas (which include all International Parks, all National Wilderness Areas that exceed 5000 acres, all National Memorial Parks that exceed 5000 acres, and all National Parks that exceed 6000 acres) from air pollution caused by humans.

Subjects: Environmental Science.


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