3月1日,北京规定在售的国Ⅳ标准车型彻底退出北京市场,全部执行京V汽车排放标准。关于汽车排放,世界各国都有哪些标准,哪个标准更严格一些?汽车排放是指汽车尾气中的CO(一氧化碳)、HC+NOx(碳氢化合物和氮氧化物)、PM(微粒,碳烟)等有害气体。当今世界,约有60%～70%的国家和地区采用欧洲标准,20%～30%的国家 March 1, Beijing’s national standard IV models sold in the country completely withdraw from the Beijing market, all of the implementation of Beijing V vehicle emission standards. About car emissions, which standards and standards are stricter in all countries in the world? Car emissions refer to CO (carbon monoxide), HC + NOx (hydrocarbons and nitrogen oxides), PM (particulate matter, soot) Other harmful gases. In today’s world, about 60% to 70% of countries and regions adopt European standards, and 20% to 30% of countries