This resulted in passage of the Clean Air Act of 1970 and subsequent amendments in 1977 and 1990.

这导致了1970年“清洁空气法案”的通过及其1977年和1990年的修订。

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The USA Clean Air Act of 1990 calls for a 90% reduction in emission of 189 toxic chemicals, 70% of them VOCs, over the next nine years.

由于环境污染的进一步加剧，1990年美国清洁空气条例要求在未来9年里将189种化学毒物的排放量削减90%，其中70%是挥发性有机物。

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One early accomplishment was the Clean Air Act of 1963, and its later amendments, which set goals and procedures for reducing automobile exhaust pollution.

最早通过的是1963年的“洁净空气法”及以后的补充条款，为减少汽车废气污染制定了目标及程序。

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The legacy of the Great Smog was the Clean Air Act of 1956 which introduced a number of measures to reduce air pollution.

BBC: News, London

So in the Clean Air Act of 1990, he proposed a plan that would cap sulfur-dioxide emissions but let the market decide how to allocate the permits.

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Media-fueled alarm about acid rain provided a basis for legislation to create markets for buying and selling excess sulfur dioxide (SO2) and nitrogen dioxide emission credits, and Project 88 became the Clean Air Act of 1990.

FORBES: Magazine Article