Test and Analysis on Air Particulate Matter Concentration of a Subway Station in Chongqing

Abstract

The subway traffic travel has been widely recognized by the general public for its convenience and efficiency. Because of the large croud of passengers and the relatively closed environment, indoor air quality directly affect the health of the passengers and the staff of the station. The concentration and distribution of particulate matter are mainly controlled by the ventilation and air conditioning system in the station, and simultaneously influenced by outdoor air quality and passengers flow. In this paper, a subway station in Chongqing, China was taken as an example to test and analyze the concentration of particulate matter in the subway station under air-conditioned situation. The results show: in the summer, the daily average concentration of PM2.5 is about 0.07 mg/m3 in outdoor test-point, the concentration of PM2.5 is among 0.035-0.057 mg/m3 in the ticket hall and on the platform, the PM2.5 concentration of the transition area exceeded the limits of the standard(0.075mg/m3) for some periods of time in the summer; the daily average concentration of PM10 is about 0.083 mg/m3 in outdoor test-point, the concentration of PM10 is among 0.038-0.074 mg/m3, and reaches a peak at 13:00 in the ticket hall and on the platform; the concentration of particulate matter in the transition area is significantly higher than that on the platform and in the ticket hall. In the winter, the transition area is very close to the concentration of particulate matter in the ticket hall, and the concentration of particulate matter on the platform is significantly higher than that in other areas. It is necessary to adopt a reasonable ventilation strategy in the transition area. The concentration distribution of particulate matter has outstanding temporal and spatial distribution, which can be used as reference for space ventilation and air conditioning operation strategy.