What does the China IV emission standard mean?
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China IV emission standard is the fourth stage national standard for motor vehicle pollutant emissions. 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, it controls and reduces vehicle emissions to below specified levels. The sixth stage national standard for motor vehicle pollutant emissions is established to implement the Environmental Protection Law of the People's Republic of China and the Air Pollution Prevention and Control Law of the People's Republic of China, aiming to prevent pollution from compression-ignition and gas-fueled spark-ignition engine vehicles, protect the ecological environment, and safeguard human health. The fifth stage national standard for motor vehicle pollutant emissions is referred to as the China V standard, which is equivalent to the fifth stage emission standard currently implemented in Europe.