Beijing University of Technology - Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Tsinghua University - Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, The University of Hong Kong - WHO Collaborating Centre for Infectious Disease Epidemiology and Control, Southeast University - School of Energy and Environment, The University of Hong Kong - Department of Mechanical Engineering, The University of Hong Kong - Department of Mechanical Engineering, Southeast University - School of Energy and Environment, University of Maryland - Maryland Institute for Applied Environmental Health, Southeast University - School of Energy and Environment, The University of Hong Kong - School of Public Health, Tsinghua University - Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Tsinghua University - Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Southeast University - School of Energy and Environment and The University of Hong Kong - Department of Mechanical Engineering