EFFECT OF HEIGHT AND LOCATION OF AIR INTAKE TOWER ON PARTICULATE MATTER CONCENTRATIONS OF SUBWAY STATIONS

초록

The indoor air of subway stations is likely to be contaminated by particulate matters, so the ventilation is essential to keep the indoor air clean at the stations. For ventilation purpose stations usually have two or more fresh air intake towers to get fresh air on the ground. However, the outdoor air is often contaminated by particulate matters from the road traffic, that the air quality of subway stations with higher fresh air intake tower is better than those with less. In addition, when the fresh air intake tower is far from the road, the indoor air quality of subway stations is better. In the literature were not found studies showing quantitative dependence of subway particulate matter concentrations on distance from road and height of the intake tower. In this study, the effect of height and location of fresh air intake tower on the particulate matters (PM-10) concentrations of subway stations was investigated. PM-10 concentrations at the platform and waiting room of 33 subway stations in Korea were analyzed by using three light-scattering counters. The height and location of air intake towers at each station was also surveyed. The relationships between PM-10 levels and height of air intake tower were and distance between nearby road and air intake tower were performed by statistical method. It was found that PM-10 levels of subway stations were lower with higher air intake tower, and with longer distance between nearby road and air intake tower. So, it could be concluded that the height of fresh air intake tower should be as high as possible, and the distance from nearby road should be as long as possible.