Fine particulate pollution driven by nitrate in the moisture urban atmospheric environment in the Pearl River Delta region of south China

Tao, Jun; Huang, Junjun; Bian, Guojian; Zhang, Leiming; Zhou, Zhen; Zhang, Zhisheng; Li, Jiawei

doi:https://open-science.canada.ca/handle/123456789/2518

Fine particulate pollution driven by nitrate in the moisture urban atmospheric environment in the Pearl River Delta region of south China

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dc.contributor.author: Tao, Jun; Huang, Junjun; Bian, Guojian; Zhang, Leiming; Zhou, Zhen; Zhang, Zhisheng; Li, Jiawei
dc.date.accepted: 2022-11-01
dc.date.accessioned: 2024-05-27T15:47:02Z
dc.date.available: 2024-05-27T15:47:02Z
dc.date.issued: 2023-01-15
dc.date.submitted: 2022-07-28
dc.description.abstract - en: To identify potential sources of fine particles (PM2.5, with aerodynamic diameter (Da) ≤ 2.5 μm) in urban Dongguan of south China, a comprehensive campaign was carried out in the whole 2019. Hourly PM2.5 and its dominant chemical components including organic carbon (OC), elemental carbon (EC), water-soluble inorganic ions (WSIIs) and thirteen elements were measured using online instruments. Gaseous pollutants including NH3, HNO3, NO2, NO and O3 and meteorological parameters were also synchronously measured. PM2.5 was dominated by carbonaceous aerosols in summer and by WSIIs in the other seasons. PM2.5 and its dominant chemical components mostly peaked around noon (10:00-14:00 LST). Furthermore, high PM2.5 levels during the daytime were closely related with the increased NO3- levels. The high mass concentrations of NO3- in urban Dongguan during the daytime were likely related with regional transport of NO3- from suburban Dongguan, which was originated from the reaction between NO2 and O3 under the moisture condition during the nighttime. Seven major source factors for PM2.5 including secondary sulfate, ship emission, traffic emission, secondary nitrate, industrial processes, soil dust and coal combustion were identified by positive matrix factorization (PMF) analysis, which contributed 26±14%, 16±16%, 16±10%, 14±11%, 12±11%, 8±6% and 8±6%, respectively, to annual PM2.5 mass concentration. Although secondary sulfate contributed much more than secondary nitrate to PM2.5 on annual basis, the latter exceeded the former source factor when daily PM2.5 mass concentration was higher than 60 μg m-3, indicating the critical role nitrate played in PM2.5 episode events.
dc.identifier.issn: 1095-8630; 0301-4797
dc.identifier.uri: https://open-science.canada.ca/handle/123456789/2518
dc.language.iso: en
dc.publisher: Elsevier
dc.relation.isreplacedby: https://doi.org/10.1016/j.jenvman.2022.116704; https://open-science.canada.ca/handle/123456789/3458
dc.rights - en: Open Government Licence - Canada
dc.rights - fr: Licence du gouvernement ouvert - Canada
dc.rights.openaccesslevel - en: Green
dc.rights.openaccesslevel - fr: Vert
dc.rights.uri - en: https://open.canada.ca/en/open-government-licence-canada
dc.rights.uri - fr: https://ouvert.canada.ca/fr/licence-du-gouvernement-ouvert-canada
dc.subject - en: Ozone; Pollutants; Environmental management
dc.subject - fr: Ozone; Polluant; Gestion de l'environnement
dc.subject.en - en: Ozone; Pollutants; Environmental management
dc.subject.fr - fr: Ozone; Polluant; Gestion de l'environnement
dc.title - en: Fine particulate pollution driven by nitrate in the moisture urban atmospheric environment in the Pearl River Delta region of south China
dc.type - en: Submitted manuscript
dc.type - fr: Manuscrit soumis
local.acceptedmanuscript.articlenum: 116704
local.article.journaltitle: Journal of Environmental Management
local.article.journalvolume: 326
local.pagination: 20 pages, annexes
local.peerreview - en: No
local.peerreview - fr: Non

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