What do National 3 and National 4 vehicles mean?

[DeNaomi]

Here is the relevant introduction about National 3 and National 4 vehicle models: 1. National 3: The National 3 standard is China's third-phase vehicle emission standard, equivalent to the Euro 3 emission standard, meaning the content of tailpipe pollutants is equivalent to that of Euro 3. The difference is that new vehicles must be equipped with an OBD, or On-Board Diagnostics system. 2. National 4 standard: Implemented nationwide on July 1, 2010, the National 4 standard upgraded the post-emission treatment system compared to National 3, reducing pollutant emissions by 50% to 60% compared to National 3. 3. Differences: The biggest difference between National 4 and National 3 is the higher emission standard. With the improvement in emission standards, there will be some changes in price and performance. National 4 meets the emission standard by converting the traditional carburetor to an electronic injection system and upgrading the exhaust system.

[LeDominic]

I've been driving for over a decade and have seen many friends ask about China 3 and China 4 standards. Simply put, these refer to the national vehicle emission standards set by the government, with higher numbers indicating stricter requirements. The China 3 standard was implemented around 2007, and was upgraded to China 4 in 2011. These emission standards regulate pollutants like carbon monoxide and hydrocarbons emitted from vehicle exhaust pipes. The China 4 standard is much stricter than China 3 - for example, China 4 vehicles must emit no more than 1 gram of carbon monoxide per kilometer, while China 3 vehicles are allowed up to 2.3 grams. Nowadays, many major cities restrict China 3 vehicles from entering urban areas, and emissions testing during annual inspections is particularly stringent. Last year when I helped a friend look at used cars, we found that the same model with China 4 certification was about 10,000 yuan more expensive than the China 3 version, precisely because China 3 vehicles face restrictions in many areas. If you're considering changing cars, it's definitely better to go for China 5 or even China 6 compliant vehicles.