What is China IV?

[MasonRose]

China IV refers to the National Phase IV Motor Vehicle Pollutant Emission Standards. The main pollutants emitted by vehicles include hydrocarbons, nitrogen oxides, carbon monoxide, and 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, these standards aim to control and reduce vehicle emissions below specified limits. As the environmental harm caused by vehicle emissions becomes increasingly severe, countries and regions worldwide have successively established limits on vehicle exhaust emissions. Among these, the European standards set by the European Union serve as a reference for most countries and regions.