@article {tian2020risk, title = {Risk of COVID-19 is associated with long-term exposure to air pollution}, journal = {medRxiv}, year = {2020}, publisher = {Cold Spring Harbor Laboratory Press}, author = {Tian, Huaiyu and Liu, Yonghong and Song, Hongbin and Wu, Chieh-Hsi and Li, Bingying and Kraemer, Moritz UG and Zheng, Pai and Yan, Xing and Jia, Guang and Zheng, Yuxin and others} }