Clean air Act Amendment (1977) established new deadlines for cleaning up polluted areas; also required review of existing air-quality standards.
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.
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。
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