随着工业的发达，城市大气污染越来越严重，这主要是由工业用煤、民用取暖、工业生产过程中的排气及汽车运输工具排出的有害气体流串到大气中造成的。据有关测试资料表明：这些污染物主要有烟尘、二氧化硫、氮氧化物、汽油、苯、酚、氟化氢、二氧化碳、硫化氢、氯气、氯化氢、? With industrial development, urban air pollution is more and more serious, which is mainly caused by the industrial coal, civil heating, exhaust gas in industrial production and the harmful gas flow discharged from motor vehicles into the atmosphere. According to the test data show that these pollutants are mainly dust, sulfur dioxide, nitrogen oxides, gasoline, benzene, phenol, hydrogen fluoride, carbon dioxide, hydrogen sulfide, chlorine, hydrogen chloride,