Asian Journal of Atmospheric Environment

Korean Society for Atmospheric Environment (한국대기환경학회)
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Chemical Composition of PM2.5 and PM10 and Associated Polycyclic Aromatic Hydrocarbons at a Roadside and an Urban Background Area in Saitama, Japan

  • Naser, TarekMohamed (Department of Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University) ;
  • Yoshimura, Yuji (Japan Environmental Sanitation Center) ;
  • Sekiguchi, Kazuhiko (Department of Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University) ;
  • Wang, Qingyue (Department of Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University) ;
  • Sakamoto, Kazuhiko (Department of Environmental Science and Technology, Graduate School of Science and Engineering, Saitama University)
  • Published : 2008.12.31
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Abstract

The chemical compositions of $PM_{2.5}$ and $PM_{10}$ and associated high-molecular-weight polycyclic aromatic hydrocarbons (PAHs) were investigated during winter and summer at a roadside and an urban background site in Saitama, Japan. The average concentrations of $PM_{2.5}$ exceeded the United States Environmental Protection Agency standards during both periods. Carbonaceous components were abundant in both the observed and calculated (by means of a mass closure model) chemical composition of $PM_{2.5}$. Traffic-related pollutants (elemental carbon and high-molecular-weight PAHs) were strongly associated with $PM_{2.5}$ rather than with larger particles. The mass concentrations of $PM_{2.5}$, as well as those of EC and PAHs associated with the particles, at the two sites were strongly correlated. Comparison of our data with source profile ratios indicates that diesel-powered vehicles were probably the main source of the measured PAHs. The PAHs concentrations were affected by meteorological conditions during our study. Our results highlight the need for the establishment of standards for $PM_{2.5}$ in Japan.

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