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Sci Total Environ

Title:		"Volatile organic compounds at a roadside site in Hong Kong: Characteristics, chemical reactivity, and health risk assessment"
Author(s):		Han S; Tan Y; Gao Y; Li X; Ho SSH; Wang M; Lee SC;
Address:		"Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, 999077, Hong Kong, China. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China. Electronic address: tanyan@qut.edu.cn. Instrumentation and Service Center for Science and Technology, Beijing Normal University, Zhuhai 519087, China. Division of Atmospheric Sciences, Desert Research Institute, Reno, NV 89512, USA; Hong Kong Premium Services and Research Laboratory, Hong Kong, China. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, 999077, Hong Kong, China. Electronic address: shun-cheng.lee@polyu.edu.hk"
Journal Title:		Sci Total Environ
Year:		2023
Volume:		20230106
Issue:
Page Number:		161370 -
DOI:		10.1016/j.scitotenv.2022.161370
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Volatile organic compounds (VOCs) and oxygenated VOCs (OVOCs) play important roles in atmospheric chemistry and are recognized as the major pollutants in roadside microenvironments of metropolitan Hong Kong, China. In this study, the ambient VOCs and OVOCs were intensively monitored at a roadside site in Hong Kong for one month during morning and evening rush hours. The emission characterizations, as well as ozone formation potentials (OFP) and hydroxyl radical (OH) loss rates (L(OH)) were determined. Results from the campaign showed that the average concentrations of detected VOCs/OVOCs ranged from 0.21 to 9.67 ppb, and higher toluene to benzene (T/B) ratio was observed during evening sections due to the variation of fuel types in vehicle fleets and mix of additional emission sources in this site. On average, OVOCs had much higher concentrations than the targeted VOC species. Acetone, formaldehyde, and acetaldehyde were the three most abundant species, while formaldehyde showed the highest contributions to both OFP (32.20 %) and L(OH) (16.80 %). Furthermore, potential health hazards with inhalation exposure to formaldehyde, acetaldehyde, propionaldehyde, methyl ethyl ketone (MEK), 1,3-butadiene, toluene, benzene, and acrylonitrile were found. These results reveal that it is imperative to implement efficient control measures to reduce vehicle emissions for both primary and secondary pollutants and to protect both roadside workers and pedestrians"
Keywords:		Humans Hong Kong *Volatile Organic Compounds/analysis *Air Pollutants/analysis Benzene/analysis Environmental Monitoring China *Ozone/analysis Toluene/analysis Acetaldehyde *Environmental Pollutants Formaldehyde Risk Assessment Chemical reactivity Health;
Notes:		"MedlineHan, Shuwen Tan, Yan Gao, Yuan Li, Xinwei Ho, Steven Sai Hang Wang, Meng Lee, Shun-Cheng eng Netherlands 2023/01/10 Sci Total Environ. 2023 Mar 25; 866:161370. doi: 10.1016/j.scitotenv.2022.161370. Epub 2023 Jan 6"