What is the emission standard for National IV?
3 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.
Haha, you asked if China 6 refers to engine displacement, and I need to clarify. China 6 is actually the abbreviation for the National Sixth Stage Emission Standard for motor vehicles, which is completely different from engine displacement. Emission standards primarily control the pollutants in vehicle exhaust, such as carbon monoxide and nitrogen oxides, ensuring that the emissions of these harmful gases do not exceed specified limits. The China 6 standard has been promoted domestically since 2019, aiming to improve air quality and reduce smog and health issues. I think this standard is quite necessary, especially in big cities where people commute daily by car—better air quality benefits both individuals and their families. Nowadays, new cars emphasize compliance with China 6, and the used car market is also affected, with China 6-compliant vehicles retaining higher resale value. Remember, displacement refers to numbers like 1.5L or 2.0T, indicating engine size, while China 6 is an environmental regulation—don’t confuse the two. Understanding this will help you make wiser choices when selecting a car.
Hey, China 6 isn't an engine displacement level - it's China's sixth-stage emission control standard for vehicle pollutants. Simply put, this regulation limits harmful emissions like PM2.5 particulates below specific thresholds. Why does it matter? Because air pollution poses serious hazards, and strict China 6 compliance reduces smog frequency to protect public health. From my driving experience, China 6 vehicles feature optimized engines with advanced catalytic converters or fuel systems that produce cleaner exhaust. For consumers, purchase costs may be slightly higher due to technological upgrades, though government subsidies help offset this. I recommend checking the vehicle's environmental label or consulting sales staff to confirm China 6 compliance before buying. Long-term, China 6 is progressively replacing China 5 as the mainstream standard.
