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近十年以来,我国的机动车行业发展日新月异,已经成为世界上汽车业的第四大生产国和第三大消费国。借鉴欧美发达国家的先进经验,逐步解决我国城市的机动车尾气污染问题是十分必要的。1美国是最早认识到车辆排放对环境产生严重污染的国家。1.1美国的机动车排放法规发展的三个时期
In the recent ten years, the development of China’s automobile industry is changing rapidly and has become the fourth largest producer and the third largest consumer of the automobile industry in the world. It is very necessary to draw lessons from the advanced experience of the developed countries in Europe and the United States to gradually solve the problem of motor vehicle exhaust pollution in our cities. 1 The United States is the first country that recognized the serious environmental pollution caused by vehicle emissions. 1.1 The United States three times the development of motor vehicle emissions regulations