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Characteristics of In-cabin PM2.5 Concentration in Seoul Metro Line Number 2 in Autumn

서울시 지하철 2호선의 가을철 객실 PM2.5 농도의 특성

  • Shin, Hyerin (Department of Environmental Health Sciences, Graduate School of Public Health, Seoul National University) ;
  • Jung, Hyunhee (Department of Environmental Health Sciences, Graduate School of Public Health, Seoul National University) ;
  • Lee, Kiyoung (Department of Environmental Health Sciences, Graduate School of Public Health, Seoul National University)
  • 신혜린 (서울대학교 보건대학원 환경보건학과) ;
  • 정현희 (서울대학교 보건대학원 환경보건학과) ;
  • 이기영 (서울대학교 보건대학원 환경보건학과)
  • Received : 2019.03.29
  • Accepted : 2019.04.20
  • Published : 2019.04.30

Abstract

Objectives: Subway is one of the most common transportation modes in Seoul, Korea. The objectives of this study were to determine characteristics of in-cabin $PM_{2.5}$ concentration in Seoul Metro Line Number 2 and to identify factors of the $PM_{2.5}$ concentration. Methods: In-cabin $PM_{2.5}$ concentrations in Seoul Metro Line Number 2 were measured using real-time monitors and the factors affecting $PM_{2.5}$ concentration in cabin were observed. Linear regression analysis of in-cabin $PM_{2.5}$ concentration and indoor/outdoor (I/O) ratio were performed. Results: In-cabin $PM_{2.5}$ concentration was associated with the in-cabin $PM_{2.5}$ concentration in previous station. In-cabin $PM_{2.5}$ concentration was correlated with ambient $PM_{2.5}$ concentration and associated with underground station with control of the in-cabin $PM_{2.5}$ concentration in previous station. I/O ratio increased as the number of passengers increased and when passing through the underground station with control of I/O ratio in previous station. Conclusion: In-cabin $PM_{2.5}$ concentration was affected by ambient $PM_{2.5}$ concentration. Therefore, management of in-cabin $PM_{2.5}$ concentrations should be based on outdoor air quality.

Acknowledgement

Supported by : 한국연구재단

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