汽车数量的日益增加,已经成为影响城市大气环境质量(品质)的主要因素。人们对加强机动车尾气污染的控制及治理已越来越重视。制订科学的标准,采用合理的检测方法,推行I/M制度已成为有关人士的 The increasing number of cars has become a major factor affecting the quality (quality) of urban air environment. People pay more and more attention to the control and management of vehicle exhaust pollution. Formulate scientific standards, adopt reasonable testing methods and promote the I / M system.