Street-scale dispersion modelling framework of road-traffic derived air pollution in Hanoi, Vietnam

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dc.contributor.authorNgo, Khoi Quang
dc.contributor.authorLe, Hoang Anh
dc.contributor.authorBang, HQ
dc.contributor.authorHarris, Neil R. P.
dc.contributor.authorDrew, Gillian H.
dc.contributor.authorMead, Mohammed Iqbal
dc.date.accessioned2023-07-13T13:45:26Z
dc.date.available2023-07-13T13:45:26Z
dc.date.issued2023-06-26
dc.description.abstractTraffic is an important source of air pollution in Vietnamese cities. The spatio-temporal variation of air pollution derived from traffic is poorly understood. Application of dispersion modelling can help but is hindered by the local scarcity of suitable input data. This study fills the data gap, by establishing a framework employing open-access global data to model emission from traffic activities in Hanoi. The outlined methodology explicitly defines road sources, calculates their emission, and employs background pollution profiles from Copernicus Atmospheric Monitoring Service (CAMS) to produce street-scale distribution maps for CO, PM10 and PM2.5. Pollution hotspots are found near major traffic flows with the highest hourly average CO, PM10 and PM2.5 concentrations at 1206, 87.5 and 61.5 μgm−3, respectively. The relationship between concentrations and properties of the road network is assessed. Motorcycles are the main emitters of the traffic sector. Emission from Heavy Good Vehicles dominate during the night, with contribution percentages increase as it gets further away from the city core. Modelled concentrations are underestimated mainly due to low vehicular emission factor. Adjusting emission factors according to vehicle quality in Vietnam greatly improves agreement. The presence of non-traffic emission sources contributes to the model underestimation. Results for comparisons of daily averaged PM values are broadly in agreement between models and observations; however, diurnal patters are skewed. This results partly from the uncertainties linked with background pollution levels from CAMS, and partly from non-traffic sources which are not accounted for here. Further work is needed to assess the use of CAMS's concentrations in Vietnam. Meteorological input contributes to the temporal disagreement between the model and observations. The impact is most noticeable with CO concentrations during morning traffic rush hours. This study recommends approaches to improve input for future model iterations and encourage applications of dispersion modelling studies in similar economic settings.en_UK
dc.identifier.citationNgo KQ, Le HA, Bang HQ, et al., (2023) Street-scale dispersion modelling framework of road-traffic derived air pollution in Hanoi, Vietnam. Environmental Research, Volume 233, September 2023, Article number 116497en_UK
dc.identifier.issn0013-9351
dc.identifier.urihttps://doi.org/10.1016/j.envres.2023.116497
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/19990
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectADMS-Urbanen_UK
dc.subjectRoad trafficen_UK
dc.subjectCarbon monoxide (CO)en_UK
dc.subjectParticle matteren_UK
dc.subjectEmissions inventoryen_UK
dc.titleStreet-scale dispersion modelling framework of road-traffic derived air pollution in Hanoi, Vietnamen_UK
dc.typeArticleen_UK

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