air quality and emission standard

例句：

1. 1.The city government has set strict air quality and emission standards for the entire region.
   市政府为整个地区设定了严格的空气质量和排放标准。
2. 2. The factory is required to meet the air quality and emission standards of the local government.
   该工厂必须满足当地政府的空气质量和排放标准。
3. 3. The new regulations will improve air quality and emission standards in the area.
   新的法规将改善该地区的空气质量和排放标准。