Wei-Chun Wang1, Nguyen Duy Dat1,2, Kai-Hsien Chi3, Moo-Been Chang This email address is being protected from spambots. You need JavaScript enabled to view it.1

1 Graduate Institute of Environmental Engineering, National Central University, Taoyuan 32001, Taiwan
2 Faculty of Chemical & Food Technology, Ho Chi Minh City University of Technology and Education, Thu Duc, Ho Chi Minh 700000, Viet Nam
3 Environmental and Occupational Health, National Yang Ming University, Taipei 11221, Taiwan

Received: April 1, 2021
Revised: August 28, 2021
Accepted: September 27, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.210074  

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Cite this article:

Wang, W.C., Dat, N.D., Chi, K.H., Chang, M.B. (2021). Characterization of PM2.5 and Particulate PAHs Emitted from Vehicles via Tunnel Sampling in Different Time Frames. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.210074


  • Particulate PAHs emitted from vehicle during different time frames are investigated.
  • Diesel vehicle strongly affects the concentration of particulate PAHs measured.
  • 15 EU-PAHs should be included for evaluating PAH emission from vehicles.


The present study investigated the emission characteristics of PM2.5 and particulate PAHs (25 congeners) emitted from vehicles in real running conditions via air sampling in the longest tunnel in Taiwan. The average PM2.5 concentrations measured in the tunnel inlet and outlet were 21.9±6.9 μg m-3 and 46.1±12 μg m-3, respectively, which are significantly higher than that measured at an ambient station nearby (12.5±6.2 μg m-3). Total particulate PAHs (P-PAHs) concentration measured at the inlet of the tunnel was 1.68±1.4 ng m-3, which was significantly lower than that measured at the outlet of the tunnel (6.31±4.8 ng m-3) while the average concentration of P-PAHs found in ambient air station was only 0.275±0.062 ng m-3. A higher concentration difference (ΔC = Cout - Cin) of particulate PAHs was found on weekday compared with that observed during the weekend due to the higher number of diesel vehicles passing through the tunnel. The concentration differences of these pollutants were higher in the daytime compared with that in the nighttime because of higher vehicle number. Pyr and PL were the dominant contributors in terms of mass concentration while BcFE was the main contributor to TEQ concentration. The results also indicate that the list of 15 EU-PAHs should be considered for evaluation of the health risk associated with the emission of PAHs from vehicles.

Keywords: Mobile sources, Tunnel sampling, timeframe emission, EU-PAHs, Benzo[c]fluorene

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