1990年洁净空气法修正案要求机动车随车配备控制约90%补给燃料汽化系统。
Clean Air Amendments (1990) required that motor vehicles be equipped with onboard systems to control about 90 percent of refueling vapors.
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。
One early accomplishment was the Clean Air Act of 1963, and its later amendments, which set goals and procedures for reducing automobile exhaust pollution.
1977年洁净空气法修正案确定了清理被污染区域的新期限，同时要求对现行空气质量标准进行评估。
Clean air Act Amendment (1977) established new deadlines for cleaning up polluted areas; also required review of existing air-quality standards.
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