Fig. 5
From: Airborne particulate matter, population mobility and COVID-19: a multi-city study in China
Associations between PM2.5 and the COVID-19 confirmed cases in 63 cities of China from January 01to March 02, 2020. Note: The results were expressed as the relative risk (RR) and 95% confidence intervals (CIs) for each 10 μg/m3 increase in PM2.5 concentrations