標題: Concentrations of ultrafine particles at a highway toll collection booth and exposure implications for toll collectors
作者: Cheng, Yu-Hsiang
Huang, Cheng-Hsiung
Huang, Hsiao-Lin
Tsai, Chuen-Jinn
環境工程研究所
Institute of Environmental Engineering
關鍵字: Ultrafine particle;Number concentration;Highway toll station
公開日期: 15-Dec-2010
摘要: Research regarding the magnitude of ultrafine particle levels at highway toll stations is limited. This study measured ambient concentrations of ultrafine particles at a highway toll station from October 30 to November 1 and November 5 to November 6, 2008. A scanning mobility particle sizer was used to measure ultrafine particle concentrations at a ticket/cash tollbooth. Levels of hourly average ultrafine particles at the tollbooth were about 3-6 times higher than those in urban backgrounds, indicating that a considerable amount of ultrafine particles are exhausted from passing vehicles. A bi-modal size distribution pattern with a dominant mode at about <6 nm and a minor mode at about 40 nm was observed at the tollbooth. The high amounts of nanoparticles in this study can be attributed to gas-to-particle reactions in fresh fumes emitted directly from vehicles. The influences of traffic volume, wind speed, and relative humidity on ultrafine particle concentrations were also determined. High ambient concentrations of ultrafine particles existed under low wind speed, low relative humidity, and high traffic volume. Although different factors account for high ambient concentrations of ultrafine particles at the tollbooth, measurements indicate that toll collectors who work close to traffic emission sources have a high exposure risk. (C) 2010 Elsevier ay. All rights reserved.
URI: http://dx.doi.org/10.1016/j.scitotenv.2010.10.023
http://hdl.handle.net/11536/26218
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2010.10.023
期刊: SCIENCE OF THE TOTAL ENVIRONMENT
Volume: 409
Issue: 2
起始頁: 364
結束頁: 369
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