What is the difference between National 4 and National 5?

1 Answers
Phillips
07/29/25 11:22pm
The differences between National 4 and National 5 are as follows: 1. Emission standards: Compared to the National 4 emission standards, the National 5 emission standards are stricter, with fewer pollutants and more environmentally friendly. 2. Control system: From the perspective of the vehicle itself, compared to National 4, the emission control system of National 5 is more complex, and the cost has also increased. Additional information: The National Fifth Stage Motor Vehicle Pollutant Emission Standard, also known as the "National 5 Standard," has an emission control level equivalent to the European Union's currently implemented Stage 5 emission standard. The EU has been enforcing this standard since 2009, with stricter limits on nitrogen oxides, hydrocarbons, carbon monoxide, and particulate matter emitted by motor vehicles. From National 1 to National 4, each upgrade in the standard reduces vehicle pollution by 30% to 50%. The National 4 emission standard is the fourth stage of motor vehicle pollutant emission standards in China. The main pollutants emitted by vehicles include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). Through the application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, vehicle emissions are controlled and reduced to below specified levels.
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