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Size distributions and sources of elements in particulate matter at curbside,urban and rural sites in Beijing[J]. Jingchun Duan 1,Jihua Tan 2,Shulan Wang 1,Jimin Hao 3,Fahe Chai 1,1.State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China 2.Key Laboratory of Computational Geodynamics,Graduate University of the Chinese Academy of Sciences,Beijing 100049,China 3.School of Environment,Tsinghua University,Beijing 10008