Raise the emission standards for certain classes of newly registered motor vehicles to euro iii levels and require installation of on - board diagnostic system for newly registered petrol vehicles of not more than 3 . 5 tonnes in parallel with the european union 与欧盟的步伐一致，把若干类别的新登记车辆的排放标准收紧至欧盟iii的水平，并规定新登记的重量不超逾3 . 5公吨的汽油车辆必须装有车载自我诊断系统。
