Evaluating major anthropogenic VOC emission sources in densely populated Vietnamese cities.
Evaluating major anthropogenic VOC emission sources in densely populated Vietnamese cities.
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DOI：
10.1016/j.envpol.2022.120927
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发表时间：
2022-12
影响因子：
8.9
通讯作者：
P. Dominutti;J. Hopkins;M. Shaw;G. Mills;H. Le;D. Huy;G. Forster;S. Keita;To Thi Hien
中科院分区：
文献类型：
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作者：
P. Dominutti;J. Hopkins;M. Shaw;G. Mills;H. Le;D. Huy;G. Forster;S. Keita;To Thi Hien
挥发性有机化合物（VOCs）在城市空气污染中起着重要作用，既作为主要污染物，又通过其对形成二次污染物（如对流层臭氧和二次有机气溶胶）的贡献。在这项研究中，在越南人口最多的两个城市，即胡志明市（胡志明市，2018年9月至10月和2019年3月）和河内（2019年3月），持续监测了30多种VOC。在环境VOC采样的同时，采用抓取采样来针对最普遍的区域特定排放源并估计其排放因子（EFs）。环境采样获得的排放比率（ER）在越南城市和地球仪的其他城市之间进行了比较。在胡志明市和河内之间没有观察到显著差异，表明存在类似的来源。此外，一个很好的全球协议，在空间上的比较，在一个因素2内，与更大的ER芳烃和戊烷在越南countries.The详细的分析来源，包括EF从乘汽车，公共汽车，卡车，摩托车，3轮摩托车，废物燃烧和燃煤排放的评估。通过对环境和近源浓度分布的比较发现，道路运输源是越南城市VOC浓度的主要贡献者。根据河内的实测EF和消费数据计算了越南城市VOC排放量，并与全球排放清单（埃德加v4. 3. 2）的估算值进行了比较。通过清单估计的道路运输部门的挥发性有机化合物总排放量与我们观察到的总排放量不一致，后者显示总排放量高出3倍。此外，清单错误地代表了挥发性有机化合物的形态，主要是异戊二烯，单萜，芳烃和含氧化合物。在区域空气质量模型中考虑到这些差异，将有助于改善对这些差异影响的预测，并有助于确定该区域减少污染战略的优先次序。
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.