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Atmosphere 2018, 9(7), 274; https://doi.org/10.3390/atmos9070274

Composition, Sources, and Distribution of PM2.5 Saccharides in a Coastal Urban Site of China

1
Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
2
Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou 310007, China
*
Author to whom correspondence should be addressed.
Received: 2 June 2018 / Revised: 14 July 2018 / Accepted: 16 July 2018 / Published: 17 July 2018
(This article belongs to the Section Air Quality)
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Abstract

The characteristics of biogenic aerosols in an urban area were explored by determining the composition and temporal distribution of saccharides in PM2.5 in Shanghai. The total saccharides showed a wide range of 9.4 ng/m3 to 1652.9 ng/m3, with the averaged concentrations of 133.1 ng/m3, 267.5 ng/m3, 265.1 ng/m3, and 674.4 ng/m3 in spring, summer, autumn, and winter, respectively. The saccharides include anhydrosaccharides (levoglucosan and mannosan), which were higher in cold seasons due to the increased biomass burning; saccharide alcohols (mannitol, arabitol, sorbitol); and monosaccharides (fructose, glucose), which were more abundant in warm seasons and attributed to the biological emissions. Through positive matrix factorization (PMF) analysis, four emission sources of saccharides were resolved, including biomass burning, fungal spores, plant decomposition, and pollen. Moreover, the process analysis of high concentrations of leveglucosan was conducted by backward trajectory and fire points. We found that concentrations of anhydrosaccharides were relatively stable under different pollution levels, while saccharide alcohols exhibited an obvious decrease with the concentration of PM2.5, indicating that biomass burning was not the core reason for heavy haze pollution. However, high level PM2.5 pollution might inhibit the effects of biological activities. View Full-Text
Keywords: saccharides; biomass burning; haze; source apportionment; bio-aerosol saccharides; biomass burning; haze; source apportionment; bio-aerosol
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Xiao, M.; Wang, Q.; Qin, X.; Yu, G.; Deng, C. Composition, Sources, and Distribution of PM2.5 Saccharides in a Coastal Urban Site of China. Atmosphere 2018, 9, 274.

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