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Impacts of traffic emissions on atmospheric particulate nitrate and organics at a downwind site on the periphery of Guangzhou, China
Qin, Yi Ming1; Tan, Hao Bo2; Li, Yong Jie3; Schurman, Misha I.4; Li, Fei2; Canonaco, Francesco5; Prevot, Andre S. H.5; Chan, Chak K.1,4,6
2017-09
Source PublicationATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
Volume17Issue:17Pages:10245-10258
Abstract

Particulate matter (PM) pollution on the peripheries of Chinese megacities can be as serious as in cities themselves. Given the substantial vehicular emissions in inner-city areas, the direct transport of primary PM (e.g., black carbon and primary organics) and effective formation of secondary PM from precursors (e.g., NOx and volatile organic compounds) can contribute to PM pollution in "buffer" zones between cities. To investigate how traffic emissions in inner-city areas impact these adjacent buffer zones, a suite of real-time instruments were deployed in Panyu, downwind from central Guangzhou, from November to December 2014. Nitrate mass fraction was higher on high-PM days, with the average nitrate-to-sulfate ratio increasing from around 0.35 to 1.5 as the PM mass concentration increased from 10 to 160 μg m-3. Particulate nitrate was strongly correlated with excess ammonium (([NH4+]/[SO42-]-1.5) x [SO42-]), with higher concentrations in December than in November due to lower temperatures. The organic mass fraction was the highest across all PM1 levels throughout the campaign. While organic aerosols (OA) were dominated by secondary organic aerosols (SOA = semi-volatile oxygenated organic aerosols + low-volatility oxygenated organic aerosols) as a campaign average, freshly emitted hydrocarbon-like organic aerosols (HOA) contributed up to 40% of OA during high-OA periods, which typically occurred at nighttime and contributed 23.8 to 28.4% on average. This was due to daytime traffic restrictions on heavy-duty vehicles in Guangzhou, and HOA almost increased linearly with total OA concentration. SOA increased as odd oxygen (Ox = O3 + NO2) increased during the day due to photochemistry. A combination of nighttime traffic emissions and daytime photochemistry contributed to the buildup of PM in Panyu. The mitigation of PM pollution in inner-city areas by reducing vehicular traffic can potentially improve air quality in peripheral areas.

DOI10.5194/acp-17-10245-2017
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS SubjectEnvironmental Sciences ; Meteorology & Atmospheric Sciences
WOS IDWOS:000409038300002
The Source to ArticleWOS
Fulltext Access
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Cited Times [WOS]:19   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorLi, Yong Jie; Chan, Chak K.
Affiliation1.Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Hong Kong, China
2.Key Laboratory of Regional Numerical Weather Prediction, Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou, China
3.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau, China
4.Division of Environment, Hong Kong University of Science and Technology, Hong Kong, China
5.Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232, Villigen PSI, Switzerland
6.School of Energy and Environment, City University of Hong Kong, Hong Kong, China
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Qin, Yi Ming,Tan, Hao Bo,Li, Yong Jie,et al. Impacts of traffic emissions on atmospheric particulate nitrate and organics at a downwind site on the periphery of Guangzhou, China[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(17):10245-10258.
APA Qin, Yi Ming.,Tan, Hao Bo.,Li, Yong Jie.,Schurman, Misha I..,Li, Fei.,...&Chan, Chak K..(2017).Impacts of traffic emissions on atmospheric particulate nitrate and organics at a downwind site on the periphery of Guangzhou, China.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(17),10245-10258.
MLA Qin, Yi Ming,et al."Impacts of traffic emissions on atmospheric particulate nitrate and organics at a downwind site on the periphery of Guangzhou, China".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.17(2017):10245-10258.
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