The indoor and outdoor PM2.5 samples were collected from a petroleum and chemical industrial city during the heating and non-heating seasons,16 types of PAHs were analyzed using HPLC technique.The distribution characteristics,sources of PAHs,and the effect on indoor air quality of outdoor air pollution were discussed.The result shows that,the total concentration of PAHs in outdoor PM2.5 which collected in non-heating season and heating season were 36.3 and 294 ng/m3 respectively.There were 14.8 and 84.6 ng/m3 in indoor PM2.5.The concentration of PAHs in outdoor and indoor samples collected in heating-season is higher than which got in non-heating season,and the dominant components of PAHs in all the samples were 4 or 5 rings PAHs.The PAHs pollution of indoor mostly came from outdoor emissions penetration.The sources of PAHs were analyzed using diagnostic ratio method,it was found that coal and oil combustion were major sources of non-heating season,while the coal combustion was major sources of heating season.%于非采暖季和采暖季分别采集某石化化工行业聚集城市中心城区室内外PM2.5样品,采用高效液相色谱法分析PM2.5上载带的16种PAHs,对其分布特征、来源以及室外PAHs污染对室内污染的贡献进行了初步探讨.结果表明,研究区域非采暖季和采暖季室外PM2.5中∑PAHs浓度日均值分别为36.3、294 ng/m3,室内PM2.5中∑PAHs浓度分别为14.8、84.6 ng/m3,均以4、5环PAHs为主;室内PAHs主要来自室外渗透污染,但同时明显存在室内排放源贡献;PAHs来源分析进一步证实研究区域PAHs主要来自煤炭、石油等不完全燃烧,采暖季煤炭燃烧源贡献更突出.
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