北京,是新中国最早生产客车的城市之一,北京公交的发展也经历了翻天覆地的变化。从1997年开始,北京公交逐渐开始关注公共汽车尾气排放的问题,从1997年到2011年的15年间,北京公共汽车尾气排放,从国Ⅰ变成了国Ⅴ,从冒黑烟的“墨斗鱼”变成了清洁燃料的绿色环保客车,为北京的蓝天计划和节能减排作出了很大贡献。早在1997年以前,北京的公共汽车主要是以解放、黄河底盘制造的京华客车为主,比如说解放系列的BK6141、 Beijing is one of the earliest cities to produce passenger cars in New China. The development of Beijing’s public transport has undergone tremendous changes. Starting from 1997, Beijing bus gradually began to pay attention to the issue of bus exhaust emissions. From 1997 to 2011, 15 years from now, Beijing bus exhaust emissions have changed from a country I to a country V, from black smokes Fish "into a clean fuel green buses, Beijing’s blue sky plan and energy-saving emission reduction has made a significant contribution. As early as 1997, Beijing’s buses were mainly Jinghua buses made by the liberation and the Yellow River chassis, for example, the liberation series BK6141,