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环境问题已是人们日益关注的话题之一。汽车尾气严重污染了空气,发达国家相继制定了严格的汽车尾气排放标准并已法律化。早在70年代,美国和欧洲就开始限制排放汽车尾气,发展至今,排放标准日趋严格。欧洲已经于2000年实施Ⅲ号排放控制标准,2005年将开始实施欧洲Ⅳ号排放标准,现在又提出在2009年实施欧洲Ⅴ号排放标准。以柴油机排放为例,欧洲Ⅱ号标准要求柴油的含硫量为500PPM,欧洲Ⅳ号标准压缩到50PPM,欧洲Ⅴ号标准讲一步提高到10PPM,要求是越来越严格了。欧洲Ⅲ号标准是目前欧洲、美国正在实施的真正意义上的低污染排放标准。据了解,汽车环保的关键是通过相关技术控制好尾气排放,减少有害气体的排放,而汽
Environmental issues have become one of the topics that people are increasingly concerned about. Car exhaust seriously polluted the air, the developed countries have formulated a strict standard for vehicle exhaust and has been legalized. As early as the 1970s, the United States and Europe began to limit the emission of automobile exhaust. Since then, emission standards have become more stringent. Europe has implemented emission control standard III in 2000 and will start implementation of emission standard Euro IV in 2005. Now it is proposed to implement emission standard Euro V in 2009. To diesel emissions, for example, the European standards require the sulfur content of diesel 500PPM, Europe Ⅳ standard compression to 50PPM, European standard Ⅴ further step up to 10PPM, the requirements are more stringent. Europe III standard is currently in Europe, the United States is being implemented in the true sense of the low emission standards. It is understood that the key to environmental protection is the vehicle through the relevant technology to control exhaust emissions and reduce emissions of harmful gases, and steam