1. A multivariate study for characterizing particulate matter (PM10, PM2.5, and PM1) in Seoul metropolitan subway stations, Korea.
- Author
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Kwon, Soon-Bark, Jeong, Wootae, Park, Duckshin, Kim, Ki-Tae, and Cho, Kyung Hwa
- Subjects
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PARTICULATE matter , *SUBWAY stations , *INDOOR air quality , *PRINCIPAL components analysis , *SELF-organizing maps - Abstract
Given that around eight million commuters use the Seoul Metropolitan Subway (SMS) each day, the indoor air quality (IAQ) of its stations has attracted much public attention. We have monitored the concentration of particulate matters (PM x ) (i.e., PM 10 , PM 2.5 , and PM 1 ) in six major transfer stations per minute for three weeks during the summer, autumn, and winter in 2014 and 2015. The data were analyzed to investigate the relationship between PM x concentration and multivariate environmental factors using statistical methods. The average PM concentration observed was approximately two or three times higher than outdoor PM 10 concentration, showing similar temporal patterns at concourses and platforms. This implies that outdoor PM 10 is the most significant factor in controlling indoor PM concentration. In addition, the station depth and number of trains passing through stations were found to be additional influences on PM x . Principal component analysis (PCA) and self-organizing map (SOM) were employed, through which we found that the number of trains influences PM concentration in the vicinity of platforms only, and PM x hotspots were determined. This study identifies the external and internal factors affecting PM x characteristics in six SMS stations, which can assist in the development of effective IAQ management plans to improve public health. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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