Particulate matters (PM) in underground station is known as one of major pollutants affecting millions of passengers’ health in their daily life. In metro-city such as Seoul, outdoor PM mostly exhausted from road traffic can be transported into underground stations and indoor sources of PM generated by friction between the wheels and the rails of train, between the wheels and the brake pads, and between the catenaries and the pantographs can be suspending in underground station. It is well known that combustion process results in nuclei mode of particles wherever friction process results in coarse mode of particles. In this study, we investigated the distribution of PMs in 6 major subway stations. PMs were measured by optical particle sizers (TSI model 3330) at the platform and the concourse level simultaneously during 48 hours consecutively for each station. Measurement was conducted during the weekdays of 11th to 29th of August 2014 which representing the summer days of Korea. Table 1 shows the average PMs in platform and concourse for 6 stations (A1, A2, B1, B2, C1, C2). Average PMs of platform were higher than those of concourse by 11.2～18.4%. Among the 6 stations of PMs, C1 and C2 stations showed low levels of PM1. Those two stations are located at the deepest level among 6 stations from ground level.
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