Evaluation on Indoor Air Quality by Statistical Analysis of Indoor Air Pollutants Concentration in a Seoul Metropolitan Underground Railway Station

Abstract

The objective of this study was to explore the characteristics of concentration of indoor air pollutants, such as PM 10 , CO 2 , and NO 2 , measured by tele-monitoring system in a Seoul Metropolitan underground railway station from January 1, 2008 to December 31, 2012. The annual average concentration of indoor air pollutants actually varied over a wide range and was found to exhibit marked variation with time and measurement sites (tunnel inlet, platform, and concourse). After installing platform screen doors, the average PM 10 concentration on platform and concourse was decreased by 43.8% and 31.2%, respectively during the study periods. The relationship between the concentration of PM 10 and meteorological parameters (relative humidity and rainfall) or the Asian dust events was regarded as statistically significant. The correlations between the number of boarding/alighting passengers and PM 10 , CO 2 , and NO 2 were calculated. A p-value of less than 0.01 was regarded as significant except NO 2 . The I/O ratio of PM 10 concentration was elevated after a congested time (about 08:00 am). The average I/O ratios of NO 2 were observed in concourse and platform on 03:00 am with 1.76±0.91 and 1.50±0.51, respectively. The average daily variation of standard excess rate of PM 10 and NO 2 concentration in concourse and platform was investigated. The highest standard excess rate was observed on 21:00 (09:00 pm). Cheng and Yan, 2011;Lee et al., 2010;Salma et al., 2009;Kim et al., 2008;Park and Ha, 2008

Source Quantification of PM10 and PM2.5 Using Iron Tracer Mass Balance in a Seoul Subway Station, South Korea

“…It was confirmed that PM concentration on platform effectively decreased after installing platform screen door (Jung et al, 2012;Kim et al, 2012;Yim et al, 2014). Other studies also show that PM2.5 concentrations were effectively reduced both in old and new subway stations (Kam et al, 2011;Martin et al,.…”