选取石化企业具有多个排放源的典型区域为研究对象，分析了其污染特征，并应用PMF模型对区域内多个点位VOCs来源进行了解析。结果表明，该研究区域VOCs浓度明显高于城市环境空气及化工园区，存在较重污染，正丁烷、异丁烷、异戊烷、正戊烷、乙醇、苯系物是该区域VOCs的主要成分。各排放源污染物差异性较大，排放特征明显。通过PMF计算获得各排放源对24个点位的贡献率，解析结果与污染物扩散规律相一致，能够较好地解释污染物来源。

A typical area with multiple emission sources in a petrochemical enterprise is selected as research object,and its pollution characteristics are analyzed.Besides,PMF model is applied to analyze VOCs sources at multiple points in the area.The results show that the concentration of VOCs in the study area is significantly higher than that in urban ambient air and chemical industrial parks,representing a relatively heavy pollution.n-Butane,isobutane,isopentane,n-pentane ethanol and benzene series are the main components of VOCs in this area.Pollutant compositions vary greatly at different emission sources and the emission characteristics are obvious.Through PMF calculation,the contribution degrees of each emission source to 24 points are obtained,and the analytical results are consistent with the pollutant diffusion law,which can better explain the pollutant source.