中文摘要：

为了解杭州市大气细颗粒物中多环芳烃（PAHs）的粒径分布特征和主要来源，于2015年12月至2016年5月在杭州市某商住区采集了不同粒径的大气细颗粒物样品，利用气相色谱质谱联用仪对其中的PAHs进行分析，并进行了细胞毒性试验。结果表明，不同粒径大气细颗粒物中PAHs的总浓度冬季均明显高于春季。冬春两季的PAHs环数粒径分布基本呈现出4环〉5环〉3环〉6环〉2环。通过特征比值法判定，杭州市大气细颗粒物中的PAHs主要来源于燃烧源和机动车尾气排放。细胞毒性试验结果表明，粒径越小的大气细颗粒物对细胞的毒性作用越强，对细胞膜损伤程度越大。

英文摘要：

To investigate the size distribution and main sources of polycyclic aromatic hydrocarbons （PAHs） in fine atmospheric particulate matter in Hangzhou, samples were collected in a commercial and residential area in Hang- zhou from December 2015 to May 2016. PAHs were detected using gas chromatography/mass spectrometry. Cell tox icity tests were also conducted. Results showed that total concentrations of PAHs in different size were all higher in winter than in spring. Furthermore,it was found that the size distribution of PAHs＇ aromatic rings almost all showed 4-ring 〉 5-ring 〉 3 ring 〉 6-ring 〉 2-ring. The diagnostic ratios revealed that the PAHs in Hangzhou mainly origi- nated from the pyrogenic sources and vehicle exhaust emission. Finally,it was demonstrated that the finer particulate matter possessed the higher cell toxicity and cytomembrane damage.