Secondary aerosol formation drives atmospheric particulate matter pollution over megacities (Beijing and Seoul) in East Asia - Yanting Qiu; Zhijun Wu; Ruiqi Man; Taomou Zong; Yuechen Liu; Xiangxinyue Meng; Jingchuan Chen; Shiyi Chen; Suxia Yang; Bin Yuan; Mijung Song; Changhyuk Kim; et al. (Atmospheric Environment, 2023)