在现代工业城市大气中,由于煤炭、汽油等含碳燃料不完全燃烧的结果,常含有一系列多环烃类物质(简称多环烃),其中所含3,4-苯并芘是一强烈致癌物质,动物实验证明:3,4-苯并芘对实验鼠以皮下给药途径诱发肿瘤的有效致癌剂量为4-25微克,半数致癌剂量为80-200微克。近数十年来,国外城市居民肺癌发病率显著上升,经研究证明:大气受致癌物质3,4-苯并芘等的污染是其重要原因之一。 3,4苯并芘化学式C_(20)H_1~2,结构式 In the atmosphere of modern industrial cities, due to the incomplete combustion of carbonaceous fuels such as coal and gasoline, they often contain a series of polycyclic hydrocarbons (polycyclic hydrocarbons), of which 3,4-benzopyrene is a strong Carcinogens, animal experiments show that: 3,4-benzopyrene on mice induced by subcutaneous routes of cancer induced effective dose of 4-25 micrograms, half of the carcinogenic dose of 80-200 micrograms. In recent decades, the incidence of lung cancer in urban residents abroad has risen significantly. The research shows that the pollution of the air by the carcinogen 3,4-benzopyrene is one of the important reasons. 3,4 benzopyrene Chemical Formula C_ (20) H_1 ~ 2, structural formula