Free L- and D-amino acids in PM2.5 in a megacity in central China, from the perspectives of pollution characteristics, atmospheric processes and sources - Nan Jiang; Zichen Wang; Yu Zhang; Kaidi Gong; Zhangpeng Guo; Jiasen Guo; Minzhen Li; Ruiqin Zhang; Hang Yuan; Yufen Zhao (Environmental Pollution, 2025)