What is the emission standard for National IV?
1 Answers
National IV is the fourth stage of China's vehicle emission standards. Below are the relevant details: National IV Standard: The National IV standard is the fourth stage of China's motor vehicle pollutant emission standards. The main pollutants emitted by vehicles include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). The standard controls and reduces vehicle emissions to below specified levels through the application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices. Vehicle Emission Standards: Vehicle emission standards are established to control the emission of pollutants from vehicles. To curb the generation of these harmful gases and encourage automobile manufacturers to improve their products to reduce the sources of these pollutants, both Europe and the United States have formulated relevant vehicle emission standards. These standards are continuously supplemented, refined, and tightened as vehicle ownership increases and environmental conditions worsen. The European standards serve as a reference for China's vehicle emission standards, and currently, new domestically produced vehicles will indicate the European emission standard that the engine's exhaust emissions meet.
