Variation of PM2.5 Concentrations in Shopping Malls in Autumn, Changsha

Good indoor air quality is very essential to shoppers. In order to characterize the indoor air quality in shopping malls, a typical shopping mall in Changsha city was selected for this study. Indoor/outdoor PM2.5 concentrations and meteorology parameters were monitored in autumn, 2014. Diurnal variation of PM2.5 concentration in both indoor different functional areas and outdoor air were discussed. Outdoor average PM2.5 concentration at any time was higher than that of indoor. Indoor average PM2.5 concentration on weekend were greater than that of weekday. Among different functional areas, the average PM2.5 concentration of cosmetics area was the highest, followed by dining area, public walkway, clothes area and shoes& bags area. Moreover, the impacts of meteorology parameters on indoor PM2.5 concentrations were analyzed. Temperature (R2=0.354) and wind speed (R2=0.285) showed moderate dependence with indoor PM2.5 concentrations. However, relative humidity (R2=0.075) and barometric pressure (R2=0.047) showed weak correlation.