With the rapid increase of urban vehicles, exhaust pollution of motor vehicles has become an important pollution source that affects the quality of atmospheric environment. This paper systematically monitors the emission level of motor vehicle gaseous pollutants under the different operating condition (high idle, idle speed) and systematically analyzes and summarizes the change law of two major pollutants of CO and HC, which has important theoretical and realistic significance on controlling the gaseous pollutant level of motor vehicles and improving the quality of atmospheric environment.%随着城市机动车保有量的迅速增加，机动车尾气污染已成为影响大气环境质量的一个重要污染源。本文系统监测了不同运行工况（高怠速、怠速）下机动车气体污染物排放水平，系统分析总结了CO和HC两种主要污染物变化规律，对控制机动车气体污染物水平，改善环境空气质量有重要理论和现实意义。
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