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Mass Concentrations and Carbonaceous Compositions of PM0.1, PM2.5, and PM10 at Urban Locations of Hanoi, Vietnam

Category: Urban Air Quality

Accepted Manuscripts
DOI: 10.4209/aaqr.2017.11.0502
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Nguyen Thi Thu Thuy1,2, Nghiem Trung Dung 1, Kazuhiko Sekiguchi3, Ly Bich Thuy1, Nguyen Thi Thu Hien1, Ryosuke Yamaguchi3

  • 1 School of Environmental Science and Technology, Hanoi University of Science and Technology, Hanoi, Vietnam
  • 2 Faculty of International Training, Thai Nguyen University of Technology, Thai Nguyen, Vietnam
  • 3 Graduate School of Science and Engineering, Saitama University, Sakura, Saitama 338-8570, Japan

Highlights

High levels of PM0.1, PM2.5, PM10, and carbonaceous components in Hanoi were found.
Trajectories affected negligibly on PM0.1 compared to larger particles.
Some meteorological factors greatly impacted on PM2.5 and PM10 compared to PM0.1.
Biomass burning might cause the abnormality of carbonaceous components and PM levels.


Abstract

24-hour samples of PM0.1, PM2.5, and PM10 were collected simultaneously for the first time at a roadside site (Vinacomin) and a mixed site (HUST) in Hanoi, Vietnam during the wet (August) and dry seasons (October to December) in 2015. High levels of PM0.1 (6.06 ± 2.71 µg m–3), PM2.5 (71.06 ± 47.52 µg m–3) and PM10 (106.47 ± 63.95 µg m–3) were observed, especially in the rice straw open burning episode. The influence of some meteorological factors and trajectories on PM0.1 concentrations was negligible compared to that on larger particles. The average concentrations of organic carbon (OC) and elemental carbon (EC) for PM0.1, PM2.5, and PM10 were 2.77 ± 0.98 µg m–3 and 0.63 ± 0.32 µg m–3, 23.81 ± 21.16 µg m–3 and 6.17 ± 5.87 µg m–3, 34.93 ± 20.07 µg m–3 and 8.38 ± 4.92 µg m–3, respectively. Total carbon (TC) accounted for 59.19%, 44.65% and 43.79% of the mass of PM0.1, PM2.5, and PM10, respectively. The OC/EC ratios ranged 3.62–5.68, in which the ratios of PM0.1 were the highest, except for those in the biomass burning period. The char - EC/soot - EC ratios widely fluctuate (0.94–4.61), meaning the more efficiency in source identification. Strong correlations between OC and EC of all particle sizes were found (R2 = 0.84–0.99), excluding those of PM0.1 in the dry season at Vinacomin (R2 = 0.61), implying the influence of biomass burning. The concentrations of Secondary Organic Carbon (SOC) were 1.12 ± 0.43 µg m–3, 9.49 ± 8.26 µg m–3, 9.59 ± 7.72 µg m–3, accounting for 42.7%, 42.3%, and 27.9% of total OC for PM0.1, PM2.5, and PM10, respectively, indicating the dominant contribution of secondary sources to OC, especially with the finer particles. The results would be significantly valuable for Vietnam’s database of atmospheric particles.

Keywords

Nanoparticles Organic carbon Elemental carbon SOC PM2.5 PM10 Hanoi Vietnam


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