What is the difference between National II and National III?

[DakotaLee]

The difference between National II and National III is that National III is more environmentally friendly than National II. Major domestic engine manufacturers have begun developing their own EGR engines to meet the National III emission standards and satisfy market demand. The EGR engine is a transitional engine from National II to National III emission stages. The true National III engine is the high-pressure common rail engine. Relevant information about automotive emission standards is as follows: 1. Introduction: Automotive emission standards refer to regulations on the content of harmful gases such as CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulates, soot) emitted from vehicle exhaust. 2. Implementation: Starting from January 1, 2004, Beijing changed the tailpipe emission standards for motor vehicles from Euro I to Euro II. By 2008, the Euro III standard was officially implemented.