What is National IV?
2 Answers
National IV is National 4, while National III and National II are represented as Ⅲ and Ⅱ respectively. The National IV emission standard is the fourth phase of the national motor vehicle pollutant emission standards. Vehicle emissions refer to harmful gases such as CO, HC, NOx, and PM discharged from exhaust. For example, Beijing will upgrade its vehicle emission standards from the current Euro I to Euro II, with Euro III standards officially implemented in 2008. 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 the pollutant emission limits. The exhaust pollutant emission limits under China's National 3 standard are 30% lower than those under the National 2 standard, and the National 4 standard will further reduce them by 60%.
China IV refers to the China 4 standard, which is the abbreviation for the fourth phase of China's automotive emission standards. I remember this standard was fully implemented around 2010, requiring vehicles to reduce pollutants in exhaust emissions, such as lowering carbon monoxide and nitrogen oxide levels. Compared to the China 3 standard, China 4 is stricter, helping to improve urban air quality and reduce smog issues. Owners of China 4 vehicles may have noticed that many major cities like Beijing and Shanghai now have restricted zones where older cars cannot enter central areas. From an environmental perspective, driving a China 4 car has a smaller impact than older models, though it’s not as clean as the latest China 6 vehicles. It’s recommended to perform regular maintenance, such as replacing air filters, to maintain emission levels and contribute to the planet. In the long run, choosing low-emission or electric vehicles is a wiser choice.
