Size and Composition of Ambient Particulates in the Yueguangshan-Tunnel, Taiwan

Mei Fang Lu; Mei Chuan Huang; Kuang Hung Cheng; Jim Jui Min Lin

doi:10.4028/www.scientific.net/AMR.726-731.2074

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 726-731Size and Composition of Ambient Particulates in...

Size and Composition of Ambient Particulates in the Yueguangshan-Tunnel, Taiwan

Abstract:

The aim of this study is to investigate the characteristics of size distribution and chemical composition of ambient particulates inside a tunnel. Inside the tunnel, the average concentration of PM_2.5 and PM_2.5-10 was 479 and 444 μg/m³ respectively. The average mass-size distribution showed a trimodal distribution (25-30, 4.0-5.0, and 2.5, PM_2.5-10, and PM_>10 were 25%, 40%, and 35% of the total suspended particulates. Because of the poor air ventilation inside the tunnel, the particulates accumulate inside the tunnel. The dominated species of PM_2.5 were EC (average concentration 122.91 μg/m³, 25.78%), OC (47.68 μg/m³, 10.53%), SO₄^2- (37.42 μg/m³, 8.24%), and NO₃^- (35.01 μg/m³, 7.95%), and were EC ( 131.77 μg/m³, 29.87%), OC (53.74 μg/m³, 12.15%), SO₄^2- (31.35 μg/m³, 7.11%), and NO₃^- (28.10 μg/m³, 6.42%) for PM_2.5-10. Results from this study showed that the concentrations of coarse particulate matter and several metals are apparently dominated by re-suspended matter rather than emissions from vehicles, e.g., Al, Ca, and Fe. Therefore, ambient particulate matter is caused by not only vehicle exhaust emission but also dusty roads and traffic-generated dust.

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Periodical:

Advanced Materials Research (Volumes 726-731)

Pages:

2074-2078

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.726-731.2074

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Online since:

August 2013

Authors:

Mei Fang Lu*, Mei Chuan Huang, Kuang Hung Cheng, Jim Jui Min Lin

Keywords:

Chemical Composition, PM_2.5, Size Distribution, Taiwan, Tunnel

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