清洁空气法令要求主要空气污染源需获得这种许可证，以防止污染物排放量的严重增加。
The Clean air Act requires major sources of air pollution to obtain such permits before making changes that would result in a significant emissions increase of any pollutant.
清洁空气法令要求主要空气污染源需获得这种许可证，以防止污染物排放量的严重增加。
The Clean air Act requires major sources of air pollution to obtain such permits before making changes that would result in a significant emissions increase of any pollutant.
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