Comparison of PAHs, Nitro-PAHs and Oxy-PAHs associated with airborne particulate matter at roadside and urban background sites in downtown Tokyo, Japan

Yuki Kojima, Koji Inazu, Yoshiharu Hisamatsu, Hiroshi Okochi, Toshihide Baba, Toshio Nagoya

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    Atmospheric polycyclic aromatic hydrocarbons (PAHs), nitro-PAHs and oxy-PAHs are emitted from primary sources. Some nitro-PAHs and oxy-PAHs can also arise from secondary formation in the atmosphere. To assess the relative importance of these sources, the polycyclic aromatic compound (PAC) concentrations were determined at a roadside (Roadside site) and on a rooftop (Urban Background site) in downtown Tokyo Japan. The concentrations of PAHs, 1-nitropyrene and oxy-PAHs at the Roadside site were higher than those at the Urban Background site, while 2-nitrofluoranthene levels were the same at both sites. However, the mean ratios of concentrations at the Urban Background site to the Roadside site were in the order 1,8-naphthalic anhydride>9,10- anthraquinone>PAHs or 1-nitropyrene or acenaphthenequinone or benzanthrone. This suggests that in addition to vehicle emissions, a considerable fraction of some of the oxy-PAHs studied originates from another source, which might be secondary formation by atmospheric PAH degradation, and this contribution varied among the oxy-PAHs.

    Original languageEnglish
    Pages (from-to)321-333
    Number of pages13
    JournalPolycyclic Aromatic Compounds
    Issue number5
    Publication statusPublished - 2010 Oct



    • Airborne particulate matter
    • Nitro-PAHs
    • Oxy-PAHs
    • PAH
    • Roadside

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Materials Chemistry
    • Organic Chemistry

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