Academician of Chinese Academy of Engineering, School of Environment, Tsinghua University, Dean of Tsinghua University Institute of Carbon Neutrality Profile / Bio Profile / Bio Prof. He is the vice-chairman of the National Expert Committee for Ecology and Environmental Protection and the Chairman of the National Teaching Steering Committee on Environmental Science and Engineering. His research focus includes PM2.5 pollution, characterization of complicated emission sources and multi-pollutant control, and the coordinated control of air pollution and greenhouse gases. Materials