Asian Journal of Atmospheric Environment

Korean Society for Atmospheric Environment (한국대기환경학회)
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Changes in Concentration Levels of Polycyclic Aromatic Compounds Associated with Airborne Particulate Matter in Downtown Tokyo after Introducing Government Diesel Vehicle Controls

  • Kojima, Yuki (Department of Resources and Environmental Engineering, Faculty of Science and Engineering, Waseda University) ;
  • Inazu, Koji (Department of Chemistry and Biochemistry, Numazu National College of Technology) ;
  • Hisamatsu, Yoshiharu (Field Science Center, Tokyo University of Agriculture and Technology) ;
  • Okochi, Hiroshi (Department of Resources and Environmental Engineering, Faculty of Science and Engineering, Waseda University) ;
  • Baba, Toshihide (Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology) ;
  • Nagoya, Toshio (Department of Resources and Environmental Engineering, Faculty of Science and Engineering, Waseda University)
  • Received : 2009.06.06
  • Accepted : 2009.08.07
  • Published : 2010.06.30
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Abstract

The effectiveness of the government regulation on tail-pipe emission for diesel vehicles issued in 2003 in Tokyo was evaluated in this study. Variations in annual average concentrations of polycyclic aromatic hydrocarbons (PAHs) and nitro-PAHs associated with airborne particulate matter were investigated in connection with the variation in airborne elemental carbon (EC) concentration in downtown Tokyo, Japan in 2006-2007 and in 1997-1998. The annual average concentrations of EC, seven different PAHs, and 1-nitropyrene were found to have decreased significantly from 1997-1998 to 2006-2007. The most prominent decrease in atmospheric concentration was observed for 1-nitropyrene, which is a representative nitro-PAH originating from diesel vehicles. This indicated that the government control has worked to considerably reduce both atmospheric mutagens and airborne particulate matter. In contrast, the concentrations of two nitro-PAHs, 2-nitrofluoranthene and 2-nitropyrene, remained the same. These nitro-PAHs are known to be formed by atmospheric nitration of their parent PAHs, and this result suggested factors other than the concentration of parent PAHs and $NO_2$ affects the degree of atmospheric formation of nitro-PAHs.

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References

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