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一、前言近几十年来,随着城市人口的增加,工业迅速发展,机动车辆的不断增加,加之居民生活用煤也与日剧增,大量废气排出严重污染着空气,威协着人们身心健康。据成都市环境保护监测站1979年在20
I. Introduction In recent decades, with the increase of urban population, the rapid development of industry, the continuous increase of motor vehicles and the increase of residential use of coal and Japan, a large amount of exhaust emissions pollute the air severely, and Wei co-hosts people’s physical and mental health . According to Chengdu Environmental Protection Monitoring Station in 1979 at 20