Characterization of summertime single aerosol particles in Chengdu (China): Interannual evolution and impact of COVID-19 lockdown - Junke Zhang; Chunying Chen; Yunfei Su; Wenkai Guo; Xinyi Fu; Yuhan Long; Xiaoxue Peng; Wei Zhang; Xiaojuan Huang; Gehui Wang (Science of The Total Environment, 2024)