The Clean Air Act was amended in 1970 to achieve National Ambient Air Quality Standards (NAAQS) in all states by 1975, then later 1977. In what year was this amendment made?

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Multiple Choice

The Clean Air Act was amended in 1970 to achieve National Ambient Air Quality Standards (NAAQS) in all states by 1975, then later 1977. In what year was this amendment made?

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