空气品质标准：指室外空气中空气污染物浓度限值。
Air quality standards means concentration limits for air pollutants in outdoor air.
前项空气品质标准由中央主管机关会商有关机关定之。
The central competent authority in consultation with the relevant agencies shall determine the air quality standards in the foregoing paragraph.
二级防制区，指一级防制区外，符合空气品质标准区域。
Class 2 control regions means areas that meet air quality standards, with the exception of Class 1 control regions.
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