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Characteristics of Traffic-related Emissions: A Case Study in Roadside Ambient Air over Xi'an, China

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Traffic-related emissions were measured at a heavy-traffic roadside in Xi'an at the end of April, 2008 to survey the exposure levels of freshly emitted carbon monoxide (CO), mass and chemical composition (OC, EC, inorganic ions, and PAHs) of PM10, and ozone (O3). In general, high levels of mass concentration and chemical species in PM10 were observed during daily heavy traffic periods (morning, noon, and evening traffic rush hours), especially in the morning traffic rush hour. OC and EC accounted for 9.3% and 3.0% of PM10 mass, respectively, and the ratios of OC/EC were constant during the heavy traffic periods (with a mean value of 3.2). Water-soluble ions constituted 14.0% of PM10 and the dominant ionic species were Ca(superscript 2+), SO4(superscript 2-), and NO3(superscript -) in the roadside samples. Re-suspended road dust constituted a large fraction of PM10, causing the PM10 samples to become more alkaline. The concentrations of 12 prior-controlled PAHs revealed the potential high health risk of this roadside area in Xi'an. The diurnal variation in CO and O3 exhibited a different trend, which indicated that CO level was largely influenced by the instantaneous emission of vehicles while O3 was closely associated with the overall traffic conditions and meteorological status.

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Roadside PM10 Chemical composition CO O3

Cited by


Huang, Y. T. (2012). 台灣西語教學之文化教學研究:分析文化教材及其學旨 [master's thesis, Tamkang University]. Airiti Library. https://doi.org/10.6846/TKU.2012.01313
王脩文(2009)。Zn-Si-B-O系玻璃陶瓷摻Mn與Sm 發光行為之研究〔碩士論文,大同大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0081-0607200917250632

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