日本是世界汽车工业界中占有举足轻重地位的国家,汽车工业已成为日本的支柱产业之一,促进了本国经济的繁荣和发展,但汽车废气排放所造成的环境污染已日益引起国内各有关方面的关注。日本运输省每隔几年就要对已颁布的汽车废气排放标准进行必要的修改和补充,并利用强制性的法规手段,督促日本汽车生产企业积极采用先进技术,以 Japan is one of the most important countries in the world automobile industry. Automobile industry has become one of the pillar industries in Japan and promoted the prosperity and development of its economy. However, the environmental pollution caused by automobile exhaust emissions has been increasingly aroused the concern of all parties attention. Every few years, the Ministry of Transport of Japan will make the necessary changes and additions to the promulgated standards for automobile exhaust emissions and will use mandatory regulatory measures to urge Japanese automobile manufacturers to actively adopt advanced technologies to