The SO2 pollution caused by coal-combustion has become the most main pollution factor in atmospheric environment.
由燃煤引起的二氧化硫污染已成为大气环境中最主要的污染因子。
The pollution of ammonia nitrogen is serious year by year in inner-river and becomes the main pollution factor though its concentration varies with different seasons.
内河涌的氨氮污染逐年严重，并呈现季节性的变化，已成为最主要的污染因子。
Obviously, air pollution is the main factor that has resulted in the frequency of hazy weather.
显然，空气污染是导致雾霾天气经常出现的主要因素。
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