Partitioning and concentration levels of atmospheric ammonia under transboundary air pollution

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To obtain phase partitioning and concentration levels of gaseous ammonia and particulate ammonium during transboundary air pollution under westerly winds, continuous muti-parameter atmospheric measurements were made in March, May, and November 2012 at Hakui in Ishikawa Prefecture, and June to July 2013 at Tottori in Tottori Prefecture where their western side is the Sea of Japan. The results suggested that not only particulate ammonium but also gaseous ammonia were transported long-range to central and western Japan.Continuous observations of total nitrate (T.NO3), which is important as a counter anion of ammonium, were performed at Suzu in Ishikawa Prefecture. Spring maximum and winter minimum of T.NO3 concentrations were observed despite of predominance of air masses originated from the Asian continent in both seasons. A main reason of the results would be wet deposition of T.NO3.