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ISSN : 2288-9167(Print)
ISSN : 2288-923X(Online)
Journal of Odor and Indoor Environment Vol.14 No.4 pp.323-330

Study of PM10 and CO2 concentrations in public transportation vehicles considering the congestion effect

Joon-Sig Jung1,Jong-Bum Kim2,3,Sung-Yeon Kim1,Woo-Seok Lee1,Gwi-Nam Bae2,Duck-Shin Park4,Soon-Bark Kwon4*
1Indoor Environment & Noise Research Division, National Institute of Environmental Resea
2Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology
3Green School (Graduate School of Energy, Environment Policy & Technology), Korea University
4Transportation Environmental Research Team, Korea Railroad Research Institute
*Corresponding author Tel : +82-31-460-5375 E-mail :


In this study, we investigated the concentrations of PM10 and CO2 in public transportation vehicles (express bus, train, KTX, and subway) reported by previous indoor air quality (IAQ) surveys carried out from 2005 to 2013 in Korea. The number of valid data for PM10 was 566 and for CO2 was 579, and all data were classified according to whether it was collected during rush-hour or non rush-hour. PM10 and CO2 concentrations in subway cabin during the rush-hour were 1.3 and 1.45 times higher, respectively, than those of non rush-hour (p<0.05) in terms of geometric mean value. PM10 and CO2 concentration of express bus and train during the rush-hour also were 1.23 times higher than those of non rush-hour with relatively weak correlations (p=0.246). Among all PM10 concentrations, 16.9% and 3.8% of PM10 concentrations exceeded the IAQ guidelines (200 μg/m3 for non-rush hour and 250 μg/m3 for rush-hour), respectively. In terms of CO2 concentrations, 10.5% and 3.0% of them exceeded the IAQ guidelines (2,500 ppm for non rush-hour and 3,000 ppm for rush-hour), respectively. As a result, concentrations of PM10 and CO2 were estimated to be dominantly influenced by the operation characteristics of public transportation, such as degree of congestion and type of vehicle. In order to improve the IAQ of public transportation vehicles, specific air purification and ventilation systems are needed, depending on the characteristics of public transportation vehicles.