In recent years, the subway system has experienced rapid development all over the world. However, the air quality in the station has attracted more public attention. This paper concentrates on the variation of the PM2.5 and PM10 concentrations on platformsin the entire operation periods of the train. The train frequency and piston wind are considered to investigate the influence of passing trains number, the train arrival and departure on the PM2.5 and PM10 concentrations on the platforms. The results show that the diurnal average concentrations of PM2.5 and PM10 on platforms are 81 and 147 μg/m3 , respectively. The maximum concentrations of PM2.5 and PM10 (104 and 173 μg/m3 , respectively) occur in the morning rush hours, when the number of passing trains is the largest. The piston wind can push the polluted air in the tunnel into the platform and increase the PM concentrations on platforms. Moreover, passengers walking can also cause the suddenly sharp increase of PM2.5 and PM10 concentrations when the train stops at the station. It can be deduced thatreasonable ventilation strategy and efficient air filtration system are necessary to be studied in the further research for the improvement of air quality and energy saving of the ventilation and air-conditioning system in subway stations.
Keywords subway station, air quality, particulate concentration, ventilation and air-conditioning system