Since 1974, the urban subway has been used as a major form of public transportation in Seoul, Korea. The air quality in the subway environment depends on the introduction of air pollutants from roadway air and its generation is caused by subway operation in the tunnel. In the subway tunnel, PM10 concentration was monitored from March 8 to 15, 2018 and from March 26 to 28, 2018, and compared with concentrations that are routinely monitored at the subway concourse and the nearest roadside air quality monitoring station (RAQMS). Overall PM10 concentration at the concourse was similar to that of the RAQMS. However, PM10 concentration in the tunnel was significantly higher than those of the subway concourse and RAQMS, and showed distinct diurnal variation caused by train operation. The dominant peak concentrations were highly correlated with the number of train operations per hour. The minimum PM10 concentration was observed between 2 am to 5 am when the train was not operated. This was similar to that of the RAQMS. Although the diurnal variation of the PM10 concentration at the concourse is not significant, the overall trend is similar to that in the tunnel.

Abstract
1. 서 론
2. 연구 방법
3. 연구결과 및 고찰
    3.1 터널 내 PM10 농도에 대한 외기 영향
    3.2 터널과 대합실에서 PM10 농도의 일변화
    3.3 차량 운행에 따른 터널 및 대합실의 PM10 농도 변화
4. 결 론
References

• 김종범(충남연구원 서해안기후환경연구소) | Jong Bum Kim (Seahaean Research Institute, ChungNam Institute)
• 이승복(한국과학기술연구원 환경복지연구센터) | Seung-Bok Lee (Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology (KIST))
• 우상희(한국기계연구원 그린동력연구실) | Sang Hee Woo (Engine Research Department, Korea Institute of Machinery and Materials (KIMM))
• 김창혁(국립환경과학원 대기환경연구과) | Chang Hyeok Kim (Climate & Air Quality Research Department, National Institute of Environmental Research (NIER))
• 이선엽(서울교통공사 보건환경처) | Seonyeop Lee (Health & Environment Department, Seoul Metro)
• 이재인(한국과학기술연구원 환경복지연구센터) | Jae-In Lee (Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology (KIST))
• 배귀남(한국과학기술연구원 미세먼지사업단) | Gwi-Nam Bae (Center for Particulate Air Pollution and Health, Korea Institute of Science and Technology (KIST)) Corresponding author