气候变化领域集成服务门户(CCPortal): Comprehensive volatile organic compound measurements and their implications for ground-level ozone formation in the two main urban areas of Vietnam

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DOI	10.1016/j.atmosenv.2021.118872
	Comprehensive volatile organic compound measurements and their implications for ground-level ozone formation in the two main urban areas of Vietnam
	Hien T.T.; Huy D.H.; Dominutti P.A.; Thien Chi N.D.; Hopkins J.R.; Shaw M.; Forster G.; Mills G.; Le H.A.; Oram D.
发表日期	2022
ISSN	1352-2310
卷号	269
英文摘要	Volatile organic compounds (VOCs) and oxygenated VOCs (OVOCs) were measured in Ho Chi Minh City (HCMC) and Hanoi, the two largest and most populous cities in Vietnam. The purpose of this study is to better understand the VOC atmospheric composition and their role in ground-level ozone formation. Online measurements of a wide range of VOCs and other pollutants were conducted using numerous instruments during different seasons (dry and rainy) in HCMC and Hanoi (spring). Our results show that the mean mixing ratio of total measured VOCs in Hanoi was 80.8 ± 40.7 ppb (mean ± standard deviation), and was similar to that observed during the rainy season (75.2 ± 44.8 ppb) in HCMC. During the dry season campaign in HCMC, which was coincident with the Hanoi campaign, total VOC was around 50% lower (40.7 ± 19.5 ppb), largely a result of increased planetary boundary layer (PBL) height and the direction of the prevailing wind. VOC profiles in both cities were dominated by alkanes (31–35%) and OVOCs (27–33%) and the proportion of alkenes (13–17%) and aromatics (12–19%) were comparable. Similarities in diurnal variation for most VOC species (except for isoprene) are seen in both cities with two clear peaks during the morning (7:00–8:00 a.m.) and evening (18:00 p.m.) rush hours, as observed for vehicular-combustion tracers (acetylene and CO). Comparisons of the ambient ratios of paired VOCs, namely i/n-pentane, and toluene/benzene, with those reported in motorcycle exhaust, roadside and gasoline samples indicate that motorcycle-related emission is likely a major contributor to VOC pollution. According to the propylene-equivalent concentration (PE conc.) and maximum incremental reactivity (MIR) methods, alkenes and aromatics were determined to be the main contributors to reactivity and ozone potential formation. Furthermore, the initial mixing ratio of VOC species was estimated based on the photochemical age method. The consumed VOCs (initial VOCs minus measured VOCs) has a similar variation trend to ground-level ozone, and a good correlation is observed in HCMC. In contrast, this result was not seen in Hanoi despite relatively high levels of PE conc. and MIR. © 2021 Elsevier Ltd
关键词	Ozone formation Photochemical reactivity Southeast Asia Urban air pollution VOCs
语种	英语
scopus关键词	Acetylene; Air pollution; Aromatic compounds; Atmospheric composition; Boundary layers; Lighting; Mixing; Motorcycles; Ozone; Compound species; Equivalent concentrations; Ground level ozone formation; Maximum incremental reactivities; Mixing ratios; Ozone formation; Photochemical reactivity; Southeast Asia; Urban air pollution; Viet Nam; Volatile organic compounds; 1,2,4 trimethylbenzene; 1,3,5 trimethylbenzene; acetaldehyde; acetone; acetylene; alcohol; alkane; alkene; aromatic compound; benzene; butane; ethane; ethylbenzene; ethylene; gasoline; hydrocarbon; isoprene; methanol; monoterpene; ortho xylene; ozone; pentane; propane; propylene; toluene; volatile organic compound; xylene; atmospheric pollution; boundary layer; ground-based measurement; measurement method; mixing ratio; ozone; urban area; volatile organic compound; air monitoring; air pollution; air pressure; air temperature; airflow; altitude; ambient air; Article; atmospheric dispersion; boundary layer; chemical modification; chemoreactivity; China; circadian rhythm; combustion; concentration ratio; dry season; exhaust gas; gas mixing; geographic distribution; motorcycle; National Capital Territory of Delhi; ozonation; photochemistry; pollution monitoring; precipitation; rainy season; relative humidity; seasonal variation; solubility; spatiotemporal analysis; summer; sunlight; time series analysis; urban area; wind power; wind speed; winter; Hanoi; Ho Chi Minh City; Viet Nam
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248103
作者单位	Faculty of Environment, University of Science, Ho Chi Minh City, Viet Nam; Vietnam National University, Ho Chi Minh City, Viet Nam; Faculty of Food Science and Technology, Ho Chi Minh City University of Food Industry, Ho Chi Minh City, Viet Nam; Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, Heslington, York, YO10 5DD, United Kingdom; National Centre for Atmospheric Science, University of York, York, YO10 5DD, United Kingdom; National Centre for Atmospheric Science, School of Environmental Sciences, University of East Anglia, Norwich, UK, United Kingdom; Faculty of Environmental Sciences, VNU University of Science, Vietnam National University, Hanoi, Viet Nam
推荐引用方式 GB/T 7714	Hien T.T.,Huy D.H.,Dominutti P.A.,et al. Comprehensive volatile organic compound measurements and their implications for ground-level ozone formation in the two main urban areas of Vietnam[J],2022,269.
APA	Hien T.T..,Huy D.H..,Dominutti P.A..,Thien Chi N.D..,Hopkins J.R..,...&Oram D..(2022).Comprehensive volatile organic compound measurements and their implications for ground-level ozone formation in the two main urban areas of Vietnam.ATMOSPHERIC ENVIRONMENT,269.
MLA	Hien T.T.,et al."Comprehensive volatile organic compound measurements and their implications for ground-level ozone formation in the two main urban areas of Vietnam".ATMOSPHERIC ENVIRONMENT 269(2022).