北九州市における浮遊粉じんの推移と現状 : 長期間の観測データ(1970-1994)から

概要

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A long-term (1970-1994) study of atmospheric aerosol has been conducted in Kitakyushu City. The annual mean concentrations of aerosol had gradually decreased until 1983 and they have been stable since then. To investigate the change of the aerosol quality, the total mass and constituents of aerosols collected for 1972-1974 (period I : heavily polluted period) and 1984-1988 (period II : improved period) were compared. The decrease rate (%) of all constituents (inorganic ions : SO_4^<2->, NO_3^-, F^-, Cl^-, Ca^<2+> and Mg^<2+> ; metals : Fe, Mn, Zn, V and Pb) except SO_4^<2-> was much larger than that of the aerosol amount. The concentration of NO_3^- in the aerosol in period II was 54% of that in period I. It was considered that this result was based on the decrease (period II/period I : 45%) of atmospheric NO_x, which was supposed to be a precursor. In contrast, there was a nonproportional relationship between the decrease (88%) of SO_4^<2-> in the aerosol and the decrease (20%) of atmospheric SO_2. These results show the characteristic of the change of aerozol in Kitakyushu City for 24 years (1970-1994).
社団法人日本薬学会の論文
1996-04-30