Yu-Hsiang Cheng 1,2, Xuan-Huy Ninh1, Shu-Lun Yeh1

Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan
Chronic Diseases and Health Promotion Research Center, Chang Gung University of Science and Technology, Chiayi 61363, Taiwan

Received: September 12, 2018
Revised: February 11, 2019
Accepted: March 13, 2019
Download Citation: ||https://doi.org/10.4209/aaqr.2018.09.0335  

Cite this article:
Cheng, Y.H., Ninh, X.H. and Yeh, S.L. (2019). Dominant Factors Influencing the Concentrations of Particulate Matters inside Train Carriages Traveling in Different Environments in the Taipei Mass Rapid Transit System. Aerosol Air Qual. Res. 19: 1579-1592. https://doi.org/10.4209/aaqr.2018.09.0335


  • PM concentrations and size distributions were measured inside metro train.
  • CO2 level inside metro train was associated with ridership.
  • PM levels were remarkably affected by the surrounding conditions of the trains.
  • Particle mass size distributions inside metro train exhibited a triple-mode pattern.


Air quality inside metro systems is a critical issue for commuters and metro employees because of the considerable time they spend traveling or working in such systems. This study measured the PM10, PM2.5, particle number (PN), and CO2 levels and particle mass size distributions inside operating trains to reveal the factors influencing the concentrations and size distributions of particulate matter (PM) inside metro train carriages traveling in different environments. The measurement results demonstrated that the CO2 level was associated with ridership and that the PM levels and particle mass size distributions were highly affected by the immediate surroundings of the train, such as whether it was journeying through underground tunnels or on ground-level tracks as well as its direction of travel. Furthermore, the particle mass size distributions inside the metro train carriages exhibited a clear triple-mode pattern, whereas those for the ground-level and underground routes differed considerably due to different particle sources.

Keywords: Train carriage; Particle mass size distribution; Journey; Underground tunnel.


Don't forget to share this article 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

Latest coronavirus research from Aerosol and Air Quality Research

2018 Impact Factor: 2.735

5-Year Impact Factor: 2.827

SCImago Journal & Country Rank

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal, promotes submissions of high-quality research, and strives to be one of the leading aerosol and air quality open-access journals in the world.