机译:Association between short-term ambient air pollution and outpatient visits for acute exacerbation of chronic obstructive pulmonary disease in Lanzhou, 2013-19
School of Public Health, Lanzhou University, Lanzhou 730000, People's Republic of China;
Gansu Provincial Hospital, Lanzhou 730050, People's Republic of China;
Department of Gerontal Respiratory Medicine, The First Hospital of Lanzhou University, Lanzhou 730000, People's Republic of China;