On-road measurements of ultrafine particle concentration profiles and their size distributions inside the longest highway tunnel in Southeast Asia

被引：30

作者：

Cheng, Yu-Hsiang ^{[1
]}

Liu, Zhen-Shu ^{[1
]}

Chen, Chih-Chieh ^{[2
]}

机构：

[1] Ming Chi Univ Technol, Dept Safety Hlth & Environm Engn, Taipei 24301, Taiwan

[2] Natl Taiwan Univ, Inst Occupat Med & Ind Hyg, Coll Publ Hlth, Taipei 10764, Taiwan

来源：

ATMOSPHERIC ENVIRONMENT | 2010年 / 44卷 / 06期

关键词：

Ultrafine particle; Number concentration; Particle size distribution; Hsuehshan tunnel; Fast Mobility Particle Sizer; PARTICULATE MATTER; INHALATION EXPOSURE; EMISSION FACTORS; AIR-POLLUTION; MAJOR HIGHWAY; LOS-ANGELES; URBAN; NUMBER; POLLUTANTS; TRANSLOCATION;

D O I：

10.1016/j.atmosenv.2009.11.040

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study measured ultrafine particle (UFP) levels and their size distributions in the Hsuehshan tunnel from August 12 to 19, 2009, using a Fast Mobility Particle Sizer. Measurement results demonstrate that traffic volume, the slope of the tunnel (downhill or uphill) and the ventilation system affected UFP levels inside the tunnel. Average UFP levels were about 1.0 x 10(5)-3.0 x 10(5) particles cm(-3) at normal traffic volume. A traffic jam in the tunnel could raise UFP levels to over 1.0 x 10(6) particles cm(-3). UFP levels at the uphill bore were significantly higher than those at the downhill bore due to high UFP levels exhausted from vehicles going uphill at high engine load conditions. UFP levels eventually diluted 10-50% with fresh air from tunnel air shafts. Gas-to-particle condensation conversion markedly produced nucleation mode particles at the tunnel entrance section. Observations also showed Aitken mode particles markedly formed by coagulation growth of nucleation mode particles in the tunnel middle section and exit section. That is, the particle size distributions changed significantly inside the tunnel. Measurement results suggest that particles in the Aitken mode in the long tunnel governed UFP levels. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：763 / 772

页数：10

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