- 期刊
- OpenAccess
Comparisons of PM(subscript 10), PM(subscript 2.5), Particle Number, and CO2 Levels inside Metro Trains Traveling in Underground Tunnels and on Elevated Tracks
並列摘要
Commuters spend considerable time, in some cases up to 1-2 h a day, traveling in metro trains. However, few studies have compared air quality between trains traveling above-ground and underground. This study measures the PM(subscript 10), PM(subscript 2.5), particle number (PN) and CO2 levels inside metro trains traveling in underground tunnels and on elevated tracks on a metro line in the Taipei metro system. The results demonstrated that PM(subscript 10), PM(subscript 2.5 ) and CO2 levels inside metro trains traveling in underground environments are approximately 20-50% higher than those in above-ground environments. However, PN levels inside metro trains traveling in underground environments are approximately 20% lower than those in above-ground ones. These measurement results reveal that levels of pollutant species inside the metro trains are significantly affected by traveling environmental conditions - in underground tunnels or on elevated tracks. Moreover, the levels of pollutant species inside the metro trains traveling on the same route are also different in different traveling directions. Fine PM inside the metro trains is transferred from the outside and significantly influenced by the surrounding conditions of the trains. Additionally, a high fraction of large coarse PM (＞ 10 μm) is observed inside the metro trains, possibly due to re-suspension by the movement of commuters. The measurement results show that, unlike PM, which is transferred from outside environments, CO2 inside metro trains is elevated internally by exhalation from commuters. Clearly, CO2 exhaled by commuters could accumulate inside metro trains and, compared to PM, is not as easily removed by the ventilation system when air circulation does not provide enough fresh air in the metro trains, particularly in trains traveling in underground environments.
並列關鍵字
Metro trains ； Underground ； Above-ground ； PM(subscript 10) ； PM(subscript 2.5) ； Particle number ； CO2延伸閱讀
- 劉明璁（2013）。Eps is utilized in the pipelines of underground Mass Rapid Transit〔碩士論文，國立臺北科技大學〕。華藝線上圖書館。https://doi.org/10.6841/NTUT.2013.00580
- Sheu, J. W. (2011). Automatic Train Regulation of Metro Line with Approximate Dynamic Programming [doctoral dissertation, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2011.02783
- Li, M. K. (2021). Theory on the Pseudogap, Charge Density Wave, Time Reversal Symmetry Breaking Fluctuation, Fermi Arc Formation, and Superconductivity in High Temperature Cuprate Superconductors [doctoral dissertation, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU202100079
- Pee, L. S. (2011). A Novel Six-Band k‧p Simulator for Hole Gate Tunneling Current in (001) and (110) Strained pMOSFETs with Polysilicon, FUSI, and Metal Gates [master's thesis, National Chiao Tung University]. Airiti Library. https://doi.org/10.6842/NCTU.2011.00729
- Hasan, M. S. A. (2009). Role of non-signage elements in the image of underground stations [master's thesis, The University of Hong Kong]. Airiti Library. https://www.airitilibrary.com/Article/Detail?DocID=U0029-1812201200016488