Abstract: Daily PM₁₀ concentrations during January 2010 and December 2011 collected from 17 monitoring stations in Shanghai were analyzed together with the meteorological conditions to reveal seasonal and spatial distributions of PM₁₀. Generally speaking, homogeneous distribution of PM₁₀ concentrations between the monitoring sites was found in Shanghai, suggesting the influence of regional transport of pollutants on the air quality in Shanghai. Wind directions and speed had strong impact on the air quality in Shanghai, with higher PM₁₀ concentrations under calm and WS winds and lower concentrations under east and southeast winds. Through the analysis of the spatial distributions of the PM₁₀ concentration by plotting the deviation of PM₁₀ concentration at each site from the
averaged concentration of all sites, regular shifting of the spatial distribution of PM10 in Shanghai under different seasons and different wind directions was found. Transport of pollutants between different functional zones in Shanghai under different wind directions was responsible for the spatial variation of PM₁₀ concentration in Shanghai. Obviously lower PM₁₀ concentrations were found under low barometric pressure, but no linear correlation could be found between pressure and PM₁₀ concentration.

Key words: meteorological condition, PM10, Shanghai, spatial distribution, transport of pollutants