前言: 目前在世界上有四种主要的汽车排气污染物的试验及分析方法,即美国联邦政府的、加利福尼亚州的、日本的及欧州的。在排气污染控制工作中最广泛使用的分析方法是加利福尼亚州的一套规定,其应用已将近十年。不久前,对于排气污染的兴趣还一直是局限于汽油机的领域。隨着更加严格的排放标准的 Foreword: Currently there are four main methods of testing and analyzing exhaust pollutants of automobiles in the world, namely the United States federal government, California, Japan and European countries. The most widely used analytical method in exhaust pollution control is a California state regulation that has been in use for almost a decade. Not long ago, the interest in exhaust pollution has also been confined to the field of gasoline engines. With more stringent emission standards