What do China III and China IV mean in automobiles?

[VanJoanna]

China III, China IV, and China V in automobile displacement refer to the emission standards for vehicles. They are as follows: 1. China's third-stage emission standard: This standard's tailpipe pollutant content is equivalent to Euro III, with the difference being that new vehicles must be equipped with an OBD, or On-Board Diagnostics system. 2. China's fourth-stage motor vehicle pollutant emission standard: Under this standard, vehicle emissions mainly include hydrocarbons, nitrogen oxides, PM, etc. Through the application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, the standard controls and reduces vehicle emissions to below specified levels. 3. China's fifth-stage motor vehicle pollutant emission standard: This standard is equivalent to the Euro 5 emission standard currently implemented in Europe. The European Union has been enforcing it since 2009, imposing stricter limits on nitrogen oxides, hydrocarbons, carbon monoxide, and suspended particles in vehicle emissions.