Analysis of PM10 Source in the Subway Cabins

초록

In this study, the causes that may influence the IAQ in the subway cabins were measured and analyzed to define the air quality level. Also, to analyze the source of PM10 were collected in 8 cabins and heavy metals were analyzed. Qualitative evaluation was performed with agglomerative hierarchical method in cluster analysis to identify pollutants. The result of the study may be summarized as follows described below. When the air quality was measured, PM10 showed 50.5~83.8 ㎍/㎥, showing relatively low level but the level is deemed to be elevated by re-dispersion of micro dusts when passengers moved for getting on and off at the station. CO2 level was at 1,411~1,768 ppm level, lower than the guideline standard of the Ministry of Environment, 2,000 ppm. However, constant management is required as the level sometimes exceeded the standard depending upon the number of passengers during operation. In case of CO, formaldehyde, and VOCs, no significant level was found. Through cluster analysis, the data could be classified into 4 clusters. Cluster #1 contained high levels of Na, Al, Fe, and Pb indicating the pollution was mostly by soil substances. Cluster #2 showed high levels of Mg and Ca