What is the equivalent of China's National IV emission standard?
2 Answers
China's National IV emission standard corresponds to the fourth stage of national vehicle pollutant emission standards. The primary pollutants from vehicle emissions include hydrocarbons, nitrogen oxides, carbon monoxide, and particulate matter. This standard requires controlling and reducing these pollutants below specified limits through technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices. The National IV standard is equivalent to Europe's Euro IV standard. Compared to the National III standard, it imposes stricter controls on vehicle emissions, requiring a further 30% to 50% reduction in pollutants beyond the National III requirements to achieve compliance.
National IV is actually the China IV emission standard, which I researched when buying a car a few years ago. It represents China's fourth-phase vehicle environmental requirements, officially implemented around 2010. Compared to the previous China III standard, China IV imposes stricter controls on carbon dioxide and carbon monoxide emissions, helping to reduce air pollution. Many new car models have now upgraded to China VI or even higher standards, so China IV vehicles can no longer be registered for new license plates in some major cities. If you're browsing the used car market, be sure to pay attention to this to avoid purchasing a car that can't be driven legally. In short, understanding vehicle standards thoroughly can save you a lot of trouble—I personally encountered a similar issue when buying an older car last time and even had to check policies at the local DMV.
