Characterization and sources of winter PM2.5 organic and elemental carbon in the high-altitude region of Qinling Mountains. - Wang, Chun-Yang; Xiao, Shun; Cai, Rui-Ting; Du, Wen-Tao; Mi, Na; Liu, Sui-Xin; Liu, Jian-Bao (Environmental Earth Sciences, 2025)