1. Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, China (M.K., Y.Z., Y.Q., Y.Z., X.C., J.W., J.H.)
2. Institute of Refrigeration and Cryogenics, and Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Zhejiang University, Hangzhou, China (J.W.)
3. Guangzhou Center for Disease Control and Prevention, Guangzhou, China (J.Y., T.S., T.S.)
4. Guangzhou Haizhu District Center for Disease Control and Prevention, Guangzhou, China (J.G., J.W.)
5. School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China (J.H.)
6. School of Energy and Environment, Southeast University, Nanjing, China (H.Q.)
7. Guangzhou Nanshan District Center for Disease Control and Prevention, Guangzhou, China (X.P.)
8. Department of Mechanical Engineering and School of Public Health, The University of Hong Kong, Hong Kong, China (Y.L.)
9. The State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China (N.Z.)