Format

Send to

Choose Destination
Environ Monit Assess. 2018 Nov 21;190(12):740. doi: 10.1007/s10661-018-7110-8.

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

Author information

1
School of Mechanical Engineering, Hanyang University, Seoul, 04763, Republic of Korea.
2
Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea.
3
Center for Particulate Air Pollution and Health, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea. gnbae@kist.re.kr.
4
Technology Research Center, Seoul Metropolitan Rapid Transit Corporation, Seoul, 04806, Republic of Korea.
5
Transportation Environmental Research Team, Korea Railroad Research Institute, Uiwang, 16105, Republic of Korea.
6
School of Mechanical Engineering, Hanyang University, Seoul, 04763, Republic of Korea. ysjnuri@hanyang.ac.kr.

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

PMID:
30465289
DOI:
10.1007/s10661-018-7110-8
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Springer
Loading ...
Support Center