What is the National Emission Standard for IV?

[BriannaFitz]

National IV refers to the National 4 emission standard. It can fully control compliance through real-time monitoring of vehicle emissions, ensuring better enforcement of the Euro III emission standards. Here is some extended information: 1. National IV Emission Standard: The National IV emission standard is the fourth phase of China's motor vehicle pollutant emission standards. The main pollutants emitted by vehicles include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). By applying technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, the standard aims to control and reduce vehicle emissions to below specified levels. 2. National 4 Standard: The National 3 and National 4 standards are based on the Euro 3 and Euro 4 vehicle emission standards. Compared to National 2, National 3 further reduces pollutant emission limits. The tailpipe pollutant emission limits under China's National 3 standard are 30% lower than those under National 2, while National 4 will reduce them by an additional 60%. To ensure stable compliance with emission limits during vehicle use and the durability of emission control performance, requirements for On-Board Diagnostics (OBD) and in-use compliance have been added.