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EEC排放法规四经修订,仍嫌不足。共同体各国遂于1985年决定于1986～93起实施新制。按排量大小分为三个级别,制定不同标准,配合不同的技术措施。1.41以下。采用二次空气系统及排气再循环(EGR);1.4～2.01,采用稀薄燃烧发动机(研制中)、氧化催化剂结合EGR,或用闭式回路三元催化净化器(TWC);21以上及采用US-83标准的国家,则在今后十多年内,TWC仍将为唯一可采用的技术。
EEC emission regulations four revised, still not enough. In 1985, the Community countries decided to implement the new system from 1986 to 1993. According to the size of the displacement is divided into three levels, to develop different standards, with different technical measures. 1.41 the following. Using a secondary air system and exhaust gas recirculation (EGR); 1.4 ~ 2.01, using a lean-burn engine (under development), an oxidation catalyst combined with EGR, or a three-way catalytic converter US-83 standard countries, TWC will remain the only technology available for more than a decade.