严重的空气污染通常是因为一个城市或其他地区在空气流动停滞期间排放了高浓度污染物。
Serious air pollution usually results over a city or other area that is emitting high levels of pollutants during a period of air stagnation.
严重的空气污染通常是因为一个城市或其他地区在空气流动停滞期间排放了高浓度污染物。
Serious air pollution usually results over a city or other area that is emitting high levels of pollutants during a period of air stagnation.
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