Measurement of Internal and External Air Pollutants of Enclosed Bus Station

Buses are one of the most commonly used forms of transportation, and air pollution occurring at the roadside poses a higher health risk than general air pollution. In particular, users of bus-only lanes suffer adverse health effects due to exposure to air pollutants emitted from vehicles running in both directions. This study was conducted on air quality characteristics of an enclosed-type bus station located in Asan City, between 14 similar to 24 October, 2022. Pollution levels at the roadside were higher than that of roadside air quality monitoring station (RAQMS), with an exception of carbon monoxide (CO). The average black carbon (BC) concentrations during the measurement period were 2.3 +/- 1.1 mu g/ m(3). The average concentration of CO2 inside the enclosed bus station was 987 ppm, which was close to the standards for the maintenance of Indoor Air Quality (IAQ). It was found that pollutant concentrations at the roadside were 1.5 to 2 times higher than the general air pollution level. The result of comparing indoor and outdoor air pollution showed that concentrations of PM10 and PM2.5 outside the enclosed bus station were 1.8 to 2 times higher than that inside. In addition, heavy metal analysis of roadside PM2.5 detected representative soil and mobile pollutants including Si, S, Al, Fe, and Ti. These results show that there is a need for both management and long-term regulatory measures for air pollution at bus stations.