State Key Joint Laboratory of Environment Simulation and Pollution Control;
Research Center for Eco-Enuironmental Sciences;
Chinese Academy of Sciences;
Beijing 100085;
China;
Center for Excellence in Regional Atmospheric Environment;
Institute of Urban Environment;
Chinese Academy of Sciences;
Xiamen 361021;
China;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
Covid-19 epidemic; Air quality; Temporal variation and spatial; distribution; Coordinated control; PM_(2.5); O3;