What is the China IV Standard?
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China IV emission standard is the national fourth-stage motor vehicle pollutant emission standard. 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, the standard aims to control and reduce vehicle emissions below specified limits. The China IV emission standard requires that the emission levels of various pollutants be approximately 50% lower than those of China III. The national emission standards are primarily based on European Union standards, with some adaptive modifications made to suit local conditions.