Indoor and Built

Effect of platform screen doors on the indoor air environment of an underground subway station Hwataik Han1, Jun-Yong Lee2 and Kyung-Jin Jang3 Contaminant concentrations in a subway station in Seoul, Korea before (March 2008) and after (March 2009) the installation of platform screen doors (PSDs) were measured to investigate the effect of the PSD system on the subway indoor environment. PM10, CO2 and NO2 concentrations were measured at the platform, concourse and tunnel areas, using an indoor air quality tele-monitoring system (IAQ-TMS) operated by the Korean Ministry of Environment. Spatial correlations of contaminant concentrations at different locations were analysed, to investigate the effect of PSD installation on the movement of contaminants through air passages between zones. The results indicate that PM10 concentrations at the platform were reduced significantly after PSD installation and were within the guideline limit. The R2 value for the platform–tunnel correlation was reduced, indicating that in the absence of PSD, a significant amount of particulate matter was introduced to the platform from the tunnel. Conversely, the CO2 level in the platform was increased slightly after PSD installation, exhibiting a strong correl-ation with the number of passengers in the station. NO2 was predominantly introduced to the platform from the outdoor environment, on the basis of the source characteristics and their movement through air passages. This paper provides the data to develop a pollution management guide to control air quality contaminants in subway stations