Using grey system theory to evaluate transportation effects on air quality trends in Japan

Tzu-Yi Pai1,2, Keisuke Hanaki2, Hsin-Hsien Ho1, Chun-Ming Hsieh2
1Department of Environmental Engineering and Management, Chaoyang University of Technology, Wufeng, Taichung, 41349, Taiwan, ROC
2Department of Urban Engineering, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

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