Seasonal and Regional Changes in Atmospheric Deposition of Polycyclic Aromatic Hydrocarbons in Hokuriku and Tokai Districts, Japan

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Seasonal and regional changes in atmospheric deposition and composition of polycyclic aromatic hydrocarbons (PAHs) were elucidated based on the investigation which was performed at several stations in Hokuriku and Tokai districts, Japan, during two winter seasons from 2003 to 2005. The following conclusions are obtained:(1) In Hokuriku district, atmospheric deposition of PAHs during winter increased at the rural/mountainous stations as well as at the urban/suburban stations. However, the increase was not observed during winter in Tokai district.(2) Cluster analysis was applied to the composition of PAHs. The PAHs composition in Hokuriku district differed from that in Tokai district. Furthermore, there were differences between Minami and Nagoya in Tokai district. In Hokuriku district, the seasonal difference was larger than regional difference.(3) Multi-regression analysis was performed for the effect of meteorological conditions on the change in PAHs composition. Wind direction was the most important factor. Subsequently precipitation and amount of solar radiation were also important.
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