Evaluating major anthropogenic VOC emission sources in densely populated Vietnamese cities

Dominutti, Pamela A., Hopkins, James R., Shaw, Marvin, Mills, Graham P., Le, Hoang Anh, Huy, Duong Huu, Forster, Grant L., Keita, Sekou, Hien, To Thi and Oram, David E. (2023) Evaluating major anthropogenic VOC emission sources in densely populated Vietnamese cities. Environmental Pollution, 318. ISSN 0269-7491

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Abstract

Volatile organic compounds (VOCs) play an important role in urban air pollution, both as primary pollutants and through their contribution to the formation of secondary pollutants, such as tropospheric ozone and secondary organic aerosols. In this study, more than 30 VOC species were continuously monitored in the two most populous cities in Vietnam, namely Ho Chi Minh City (HCMC, September-October 2018 and March 2019) and Hanoi (March 2019). In parallel with ambient VOC sampling, grab sampling was used to target the most prevalent regional-specific emission sources and estimate their emission factors (EFs). Emission ratios (ERs) obtained from ambient sampling were compared between Vietnamese cities and other cities across the globe. No significant differences were observed between HCMC and Hanoi, suggesting the presence of similar sources. Moreover, a good global agreement was obtained in the spatial comparison within a factor of 2, with greater ER for aromatics and pentanes obtained in the Vietnamese cities. The detailed analysis of sources included the evaluation of EF from passenger cars, buses, trucks, motorcycles, 3-wheeled motorcycles, waste burning, and coal-burning emissions. Our comparisons between ambient and near-source concentration profiles show that road transport sources are the main contributors to VOC concentrations in Vietnamese cities. VOC emissions were calculated from measured EF and consumption data available in Hanoi and compared with those estimated by a global emission inventory (EDGAR v4.3.2). The total VOC emissions from the road transport sector estimated by the inventory do not agree with those calculated from our observations which showed higher total emissions by a factor of 3. Furthermore, the inventory misrepresented the VOCs speciation, mainly for isoprene, monoterpenes, aromatics, and oxygenated compounds. Accounting for these differences in regional air quality models would lead to improved predictions of their impacts and help to prioritise pollution reduction strategies in the region.

Item Type: Article
Additional Information: Funding Information: This study was funded by the RCUK ( Research Councils UK )- NAFOSTED (Vietnam National Foundation for Science and Technology Development ) Newton Fund Research Partnership under grant number NE / P014771/1 .is made to Dr Katie Read from the Atmospheric Measurement and Observation Facility (AMOF), National Centre for Atmospheric Science ( NCAS ) for the support of the ozone and carbon monoxide measurements. The authors would like to kindly thank the dedicated efforts of Nguyen Viet Thanh, Nguyen Doan Thien Chi and Tran Anh Ngan for collecting samples and participating in the field campaigns. Funding Information: This study was funded by the RCUK (Research Councils UK)- NAFOSTED (Vietnam National Foundation for Science and Technology Development) Newton Fund Research Partnership under grant number NE/P014771/1.is made to Dr Katie Read from the Atmospheric Measurement and Observation Facility (AMOF), National Centre for Atmospheric Science (NCAS) for the support of the ozone and carbon monoxide measurements. The authors would like to kindly thank the dedicated efforts of Nguyen Viet Thanh, Nguyen Doan Thien Chi and Tran Anh Ngan for collecting samples and participating in the field campaigns. Publisher Copyright: © 2022 Elsevier Ltd
Uncontrolled Keywords: emission ratios,global inventories,regional emission sources,southeast asia,toxicology,pollution,health, toxicology and mutagenesis,sdg 11 - sustainable cities and communities ,/dk/atira/pure/subjectarea/asjc/3000/3005
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: LivePure Connector
Date Deposited: 04 Mar 2024 18:29
Last Modified: 04 Mar 2024 18:29
URI: https://ueaeprints.uea.ac.uk/id/eprint/94462
DOI: 10.1016/j.envpol.2022.120927

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