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Size-dependent characteristics of diurnal particle concentration variation in an underground subway tunnel

  • Sang-Hee Woo
  • Jong Bum Kim
  • Gwi-Nam BaeEmail author
  • Moon Se Hwang
  • Gil Hun Tahk
  • Hwa Hyun Yoon
  • Soon-Bark Kwon
  • Duckshin Park
  • Se-Jin YookEmail author
Article
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Abstract

Understanding characteristics of diurnal particle concentration variation in an underground subway tunnel is important to reduce subway passengers’ exposure to high levels of toxic particle pollution. In this study, real-time particle monitoring for eight consecutive days was done at a shelter located in the middle of a one-way underground subway tunnel in Seoul, Republic of Korea, during the summer of 2015. Particle mass concentration was measured using a dust monitor and particle number concentration using an optical particle counter. From the diurnal variations in PM10, PM2.5, and PM1, concentrations of particles larger than 0.54 μm optical particle diameter were affected by train frequency whereas those of particles smaller than 0.54 μm optical particle diameter were not changed by train frequency. Number concentration of particles smaller than 1.15 μm optical particle diameter was dependent on outdoor ambient air particle concentration level, whereas that of particles larger than 1.15 μm optical particle diameter was independent of outdoor ambient air due to low ventilation system transmission efficiency of micrometer-sized particles. In addition, an equation was suggested to predict the diurnal particle concentration in an underground tunnel by considering emission, ventilation, and deposition effects.

Keywords

Aerosol PM Subway tunnel Train frequency 

Notes

Acknowledgments

This research was supported by the Railway Technology Research Project (18RTRP-B082486-05) from the Ministry of Land, Infrastructure and Transport, Republic of Korea.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Sang-Hee Woo
    • 1
    • 2
  • Jong Bum Kim
    • 2
  • Gwi-Nam Bae
    • 3
    Email author
  • Moon Se Hwang
    • 4
  • Gil Hun Tahk
    • 4
  • Hwa Hyun Yoon
    • 4
  • Soon-Bark Kwon
    • 5
  • Duckshin Park
    • 5
  • Se-Jin Yook
    • 1
    Email author
  1. 1.School of Mechanical EngineeringHanyang UniversitySeoulRepublic of Korea
  2. 2.Center for Environment, Health and Welfare ResearchKorea Institute of Science and TechnologySeoulRepublic of Korea
  3. 3.Center for Particulate Air Pollution and HealthKorea Institute of Science and TechnologySeoulRepublic of Korea
  4. 4.Technology Research CenterSeoul Metropolitan Rapid Transit CorporationSeoulRepublic of Korea
  5. 5.Transportation Environmental Research TeamKorea Railroad Research InstituteUiwangRepublic of Korea

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