Polycyclic aromatic hydrocarbons (PAHs) in the urban air was highly caused by rapid urbanization and automobile development ,and Benzo(a) pyrene (BaP) also increased accordingly. Plants were natural air filters, could retard and absorb and accumulate all%城市化及汽车的发展导致城市大气中多环芳烃(PAHs)含量较高,强致癌作用污染物苯并(a)芘(BaP)含量也相应增高。植物是大气环境天然的过滤器,能滞留、吸附和累积空气中多种污染物。选择广州市8种常见行道树,4种乔木:红花羊蹄甲(Bauhiniablakeana)、腊肠树(Cassiafistula)、高山榕(Ficusaltissima)、白兰(Micheliaalha)和4种灌木:福建茶(Carmonamicrophylla)、灰莉(Fagraeaceilanica)、黄金榕(Ficusmicrocar
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