What is the difference between National 4 and National 5?
2 Answers
The differences between National 4 and National 5 emission standards for vehicles are: 1. Different nitrogen oxide (NOx) emission limits: National 4 sets the NOx emission limit at 0.08 milligrams per cubic meter, while National 5 reduces it to 0.06 milligrams per cubic meter. 2. Different standard codes: National 4 follows the GB18352.32005 standard, whereas National 5 complies with GB18352.52013. Methods to distinguish between National 4 and National 5 vehicles include: 1. Checking the vehicle's fuel consumption label; 2. Inspecting the vehicle's nameplate; 3. Examining the engine model number; 4. Looking for the environmental protection mark; 5. Visiting the official motor vehicle environmental protection website.
Recently, many folks have been asking about the differences between China 4 and China 5 emission standards, so I'll share my personal experience as a car mechanic. China 4 was introduced around 2011, while China 5 was upgraded around 2017. The most noticeable difference is stricter exhaust regulations—China 5 vehicles emit one-third less carbon monoxide and half the nitrogen oxides compared to China 4. Technologically, China 5 vehicles are more advanced, commonly equipped with OBD monitoring systems and additional sensors in the exhaust pipes. Fuel quality has also improved significantly, with today's 95-octane gasoline being much cleaner. In practice, China 5 cars are more eco-friendly, and in big cities, China 4 vehicles are often restricted from entering the second ring road. If you're buying a used car, make sure to check the emission label—I got burned last year when I bought a Passat without paying attention to this.
