혼잡영향에 따른 대중교통 차량 내 PM10과 CO2 농도 특성에 관한 연구

Abstract

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 2013in Korea. The number of valid data for PM10 was 566 and for CO2 was 579, and all data were classified accordingto whether it was collected during rush-hour or non rush-hour. PM10 and CO2 concentrations in subway cabinduring the rush-hour were 1.3 and 1.45 times higher, respectively, than those of non rush-hour (p<0.05) in termsof geometric mean value. PM10 and CO2 concentration of express bus and train during the rush-hour also were1.23 times higher than those of non rush-hour with relatively weak correlations (p=0.246). Among all PM10concentrations, 16.9% and 3.8% of PM10 concentrations exceeded the IAQ guidelines (200 μg/m3 for non-rushhour and 250 μg/m3 for rush-hour), respectively. In terms of CO2 concentrations, 10.5% and 3.0% of themexceeded 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 ofpublic transportation, such as degree of congestion and type of vehicle. In order to improve the IAQ of publictransportation vehicles, specific air purification and ventilation systems are needed, depending on the characteristicsof public transportation vehicles.