Congress amended the Clean Air Act that year to set up a market for the permits that power plants must have to release sulfur dioxide (SO2) -a major culprit in acid rain-out of their smokestacks.

美国国会修订空气清净法案，建立了二氧化硫(SO2)排放许可的市场，电厂都必须持有执照，才能从烟囱排出这种造成酸雨的元凶。

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Congress amended the Clean Air Act that year to set up a market for the permits that power plants must have to release sulfur dioxide (SO2) -a major culprit in acid rain-out of their smokestacks.

美国国会修订空气清净法案，建立了二氧化硫(SO2)排放许可的市场，电厂都必须持有执照，才能从烟囱排出这种造成酸雨的元凶。

youdao