Tracking Air Pollution in China: Near Real-Time PM2.5 Retrievals from Multiple Data Sources. - Guannan Geng; Qingyang Xiao; Shigan Liu; Xiaodong Liu; Jing Cheng; Yixuan Zheng; Dan Tong; Bo Zheng 005; Yiran Peng; Xiaomeng Huang; Kebin He; Qiang Zhang (CoRR, 2021)