Interactive comment on “Analysis of Influential Factors for the Relationship between PM2.5 and AOD in Beijing” by Caiwang Zheng et al

The relationship between satellites observed aerosol optical depth to PM2.5 at surface is important to monitor and quantify the air pollution at ground from satellite observations which is relatively more independent and has less artificial errors than groundbased measurements. However, the physical connection between AOD and PM2.5 is relatively indirect and weak thus can be affected by multiple factors. This study utilized most existing state-of-art measurements and observations of aerosol and meteorology parameters to investigate the impacts from aerosol type, relative humidity (RH), the height of boundary layer (PBLH), wind speed, wind direction and the vertical distribution of aerosol on the relationship of AOD-PM2.5 in Beijing, China. This investigation is comprehensive, timing and with high scientific significance given the very serious situation of air pollution in China. I suggest to accept it for publication in ACP after minor revisions and addressing the following questions.