自動車排出ガスに係るリスクアセスメント(1) : 二酸化窒素及び浮遊粒子状物質の高濃度データに関するクラスター分析

概要

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The investigations on the data of high concentrations of nitrogen dioxide (NO_2)and suspended participate matter (SPM) were carried out at monitoring stations for automobile exhaust gas from April 2000 to March 2001 in Japan. The concentrations (daily average 98 percentile values) at the monitoring stations were analyzed by using cluster analysis. The results obtained were as follows: (1) There were 24 monitoring stations that both of NO_2 and SPM concentrations exceeded the environmental standard. (2) The dendrogram obtained by Ward method was classified into 4 clusters according to the concentrations of NO_2 and SPM. (3) One cluster was consisted from two monitoring stations that NO_2 and SPM concentrations were exceedingly high together. It became clear that two districts near two stations (Nakasendodaiwa and Matsubarabashi stations) were extremely damaged by NO_2 and SPM exhausted from automobile. (4)The correlation coefficient was 0.578 between NO_2 and SPM concentrations at 24 monitoring stations(p<0.01).
埼玉学園大学の論文