Fig. 2From: Airborne particulate matter, population mobility and COVID-19: a multi-city study in ChinaAssociations between MSI and the COVID-19 confirmed cases in 63 cities of China from January 01 to March 02, 2020. Note: The results were expressed as the relative risk (RR) and 95% confidence intervals (CIs) for each 1 unit increase in MSIBack to article page