Ambient mixing ratios of chlorofluorocarbons, hydrochlorofluorocarbons and hydrofluorocarbons in 46 Chinese cities - Xuekun Fang; Jing Wu; Jianhua Xu; Huang, Daikuan; Yehong Shi; Dan Wan; Wu, Hai; Min Shao; Hu, Jianxin (Atmospheric EnvironmentAtmospheric Environment, 2012)