Peking University, Peking University, Peking University, Peking University, Peking University, Peking University, Peking University, Peking University, Peking University, Peking University, Peking University, affiliation not provided to SSRN, Paul Scherrer Institute (PSI) - Laboratory of Atmospheric Chemistry, Peking University, Peking University and Peking University - College of Environmental Science and Engineering