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鹿児島市の大気汚染調査（第23報） : 平成21年度調査報告 Air Pollution in Kagoshima City (Part 23) : Investigation from April 2009 to March 2010 河井, 晴恵 KAWAI, Harue 上山, 由貴 UEYAMA, Yoshiaki 大山, 謙二 OHYAMA, Kenji 中島, 常憲 NAKAJIMA, Tsunenori 髙梨, 啓和 TAKANASHI, Hirokazu 大木, 章 OHKI, Akira open access air pollution Kagoshima City falling dust NO_2 Air pollution in Kagoshima City from April 2009 to March 2010 was investigated with particular emphasis on the falling dust (volcanic ash fall) from Mt. Sakurajima. The falling dust was collected monthly with rainwater at eight locations in Kagoshima City. After the sample had been filtered, the residue was dried and weighed, and the filtrate was analyzed for SO_4＾< 2->, Cl＾-, and water-soluble matter, as well as for pH. The average monthly falling dust at the eight locations in Kagoshima City was 40.4 g・m＾<-2>・month＾<-1>, which was about 3.5 times higher than that observed in the last fiscal year. Although the tendency of low falling dust has continued since 2001, recently the falling dust rapidly increased year by year. The concentration of NO_2 in the air was measured by use of the "filter-badge method". The average NO_2 concentration at the eight locations was 7.6 ppb, which was somewhat higher than that for the last year. 鹿児島大学 Kagoshima University 2010-10 jpn departmental bulletin paper VoR http://hdl.handle.net/10232/9982 https://ir.kagoshima-u.ac.jp/records/7476 0451212X AN00040363 鹿児島大学工学部研究報告 The research reports of the Faculty of Engineering, Kagoshima University 52 31 36 https://ir.kagoshima-u.ac.jp/record/7476/files/AN00040363_v52_p31-36.pdf application/pdf 546.5 kB 2016-10-28 2010-10