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学術研究成果リスト

Detail of Grant Awarded Academic Researches

Project

The evaluation for environmental influence on the Tama basin by analysis of the long term observation data for acid rain in Tokyo metropolitan area.

Academic
Research
No.311
Principal
Investigator
Shigeru Tanaka
Affiliation Professor, Tanaka Lab, Keio University
Research
Summary
Air pollution situation in Tokyo metropolitan area remained on the same level in the 1990’s. In the early 2000’s, the regulation of diesel exhaust gas from bus and truck was started by Tokyo Metropolitan Government and the Ministry of Environment. Recently, the concentrations of NOx and SPM (Suspended Particulate Matter) in Tokyo metropolitan area have decreased to 40 to 50 % of those in the early 2000’s due to the regulation of diesel exhaust gas. As the result of the improvement of air pollution in Tokyo metropolitan area, it can be predicted that the situation of acid rain in Tokyo metropolitan area and the Tama basin is quite changed. In this study, the environmental influence on the Tama basin was investigated by analysis of the long term observation data for acid rain in Tokyo metropolitan area.

It is very important to continue environmental monitoring for a long period to understand the trend for air pollution and acid rain. The monitoring for acid rain has been operated at 6 sites, Yokohama, Kashiwa, Fujisawa, Hachioji, Lake Yamanaka, and Ohta in Tokyo metropolitan area for 24 years from 1990 to 2013 by researchers of the Society for Acid Rain Research. Concentrations of NOx and SPM (Suspended Particulate Matter) in Tokyo metropolitan area which remained on the same level during dozens of years largely decreased due to the regulation of diesel exhaust gas in the early 2000’s. In this study, the improvement of acidification of rain water in Tokyo metropolitan area was investigated by analysis of the observation data for 24 years from 1990 to 2013. It can be mentioned that this study is a good example to show a solution to pollution problem by introducing the effective environmental regulation.
Collaborators
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