Sources apportionment of PM 2.5 in a background site in the North China Plain Yao, Lan ; Yang, Lingxiao ; Yuan, Qi ; Yan, Chao ; Dong, Can ; Meng, Chuanping ; Sui, Xiao ; Yang, Fei ; Lu, Yaling ; Wang, Wenxing Abstract Publication: Science of the Total Environment Pub Date: January 2016 DOI: 10.1016/j.scitotenv.2015.09.123 Bibcode: 2016ScTEn.541..590Y