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tion. Conclusions: All six printing workers with cholangiocarcinoma were exposed to very high levels of 1,2-DCP for a long term. (J Occup Health 2014; 56: 332−338)

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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,