1968年，《清洁空气法》修正案要求烧煤和天然气等其他燃料的工厂必须使用高烟囱。烟囱建得越高，空气污染就能更快地驱散。
In 1968 its amendment ordered industries burning coal, gas or other fuels to use tall chimneys. The higher the chimney, the better the dispersal of the air pollution.
1968年，《清洁空气法》修正案要求烧煤和天然气等其他燃料的工厂必须使用高烟囱。烟囱建得越高，空气污染就能更快地驱散。
In 1968 its amendment ordered industries burning coal, gas or other fuels to use tall chimneys. The higher the chimney, the better the dispersal of the air pollution.
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