Notice of Retraction Characteristics of Particulate Polycyclic Aromatic Hydrocarbons (PAHs) in the Three Typical Cities of the Pearl River Delta, China

Particulate Polycyclic Aromatic Hydrocarbons (PAHs) are ubiquitous pollutants in the urban atmosphere, which are harmful to human health. PM 2.5 samples in the urban atmosphere of Guangzhou, Dongguan and Zhaoqing were collected between 18 and 24 October 2009. Sixteen USEPA priority PAHs in PM 2.5 samples were analyzed with GC-MS (gas chromatography-mass spectrometry). The result showed that the atmospheric PAH concentrations varied between 4.09 and 30.83 ng/m 3 , and the main chemical constitution of PAHs in PM2S were Benzo(b), Fluoranthene (BbF), Indeno (1,2,3-cd) pyrene (IcdP)., Benzo (ghi) perylene (BghiP). The average concentration of the BaP in each city were as follows: ZhaoQing was 0.47ng/m 3 , DongGuan was 1.62ng/m 3 , and Guanzhou was 0.82ng/m3. Because of their molecular structures and content, most PAHs associated with PM 2.5 in the three cities are carcinogenic substances.