There was also passage of the Clean Water Act and the Clean Air Act was strengthened.
《清洁水法》也通过了，并且《清洁空气法》也得到了支持。
In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.
在《清洁空气法案》强制要求美国使用无铅气体的二十年里，铅在世界范围内的累积量显著下降。
Forty years after the Clean Air Act, more people are breathing easier.
空气清洁法实行后40年来，越来越多人呼吸到更加清新的空气。
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