Variation of PM_(2.5) Concentrations in Shopping Malls in Autumn, Changsha

摘要

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 was selected for this study. Indoor/outdoor PM_(2.5) concentrations and meteorology parameters were monitored in autumn, 2014. Diurnal variation of PM_(2.5) concentration in both indoor different functional areas and outdoor air were discussed. Outdoor average PM_(2.5) concentration at any time was higher than that of indoor. Indoor average PM_(2.5) concentrations on weekend were greater than that of weekday. Among different functional areas, the average PM_(2.5) 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 PM_(2.5) concentrations were analyzed. Temperature (R~2=0.354) and wind speed (R~2=0.285) showed moderate dependence with indoor PM_(2.5) concentrations. However, relative humidity(R =0.075) and barometric pressure (R~2=0.047) showed weak correlation.