What is the National Emission Standard for IV?
3 Answers
National IV refers to the National 4 emission standard. It can fully control compliance through real-time monitoring of vehicle emissions, ensuring better enforcement of the Euro III emission standards. Here is some extended information: 1. National IV Emission Standard: The National IV emission standard is the fourth phase 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). By applying 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 to below specified levels. 2. National 4 Standard: The National 3 and National 4 standards are based on the Euro 3 and Euro 4 vehicle emission standards. Compared to National 2, National 3 further reduces pollutant emission limits. The tailpipe pollutant emission limits under China's National 3 standard are 30% lower than those under National 2, while National 4 will reduce them by an additional 60%. To ensure stable compliance with emission limits during vehicle use and the durability of emission control performance, requirements for On-Board Diagnostics (OBD) and in-use compliance have been added.
I have been researching automotive emission standards for many years. China IV is the fourth-stage emission standard for light-duty vehicle pollutants in China, which was partially implemented around 2005 and fully promoted in 2010. The standard requires stricter control of carbon monoxide, hydrocarbons, and nitrogen oxide emissions, equivalent to the Euro IV specification in Europe. For example, the CO emissions of a gasoline vehicle are significantly lower than those under China III. During testing, compliance is verified through simulated urban and highway driving cycles, using exhaust gas analysis equipment for detection. When buying a car, you can identify its environmental performance by looking for the China IV label on the vehicle. However, China V and China VI standards are now more popular and more environmentally friendly. If you are choosing a used car, China IV vehicles offer good value for money but may face restrictions in cities with emission control zones. Regular maintenance in daily use can help maintain emission performance and extend the vehicle's lifespan.
As an average car owner who prioritizes environmental friendliness in daily driving, the China IV emission standard represents an intermediate level of vehicle emissions. I owned a China IV-compliant car purchased around 2012, which felt more fuel-efficient than older China III models with noticeably less exhaust odor. The standard controls pollutants like NOx and particulate matter to improve air quality, though mechanics warned that China IV systems are prone to minor issues like catalytic converter clogging, requiring more frequent maintenance. With China V and VI standards now introducing cleaner new vehicles, I've upgraded to a China VI model with lower fuel consumption. Buying guides recommend prioritizing higher emission-standard vehicles, especially in major cities to avoid traffic restrictions. While China IV cars offer affordable practicality in the used market, considering long-term upgrades is advisable.
