What are the differences between National V and National VI?

[VanJayce]

The differences between National V and National VI are: 1. Different carbon monoxide emission levels: National V's carbon monoxide emission is 1000 milligrams; National VI's carbon monoxide emission is 700 milligrams. 2. Different emission limits: National V's emission limit is 0.0045 grams per kilometer; National VI's emission limit is 0.25 grams per kilometer. 3. Different full names: National V's full name is the National Fifth Stage Motor Vehicle Pollutant Emission Standard; National VI's full name is the National Sixth Stage Motor Vehicle Pollutant Emission Standard. Both National V and National VI regulate the content of harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides, particulate matter, and soot emitted from vehicle exhaust.

[Nelson]

I previously owned a China 5 vehicle and later upgraded to China 6. The most noticeable difference is the much stricter emission standards. China 5 had relatively lenient requirements, but China 6 significantly reduced pollutant limits—for example, nitrogen oxide and particulate emissions were cut by about half, forcing automakers to improve engine technology. Additionally, the implementation timelines differ: China 5 was rolled out nationwide earlier, while China 6 was introduced in two phases (a and b), with the more stringent Phase b fully enforced in 2023. It also introduced Real Driving Emissions (RDE) testing. When buying a car, China 6-compliant vehicles better adapt to environmental policies, such as avoiding urban driving restrictions and maintaining higher resale value. I also noticed slightly higher fuel prices, but overall, they are more fuel-efficient and eco-friendly. I recommend opting for China 6 when purchasing a new car, especially checking for the RDE label. Long-term, this drives innovation in automakers, like hybrid and electric trends, significantly improving air quality—I’ve personally felt the air become much fresher.

[IkerMarie]

As an environmental advocate, I believe the main difference between China 5 and China 6 standards lies in their environmental benefits. The China 6 standard makes vehicle emissions cleaner by imposing stricter controls on harmful substances like carbon monoxide and nitrogen oxides, and its testing procedures better reflect real-world driving conditions. This leads to reduced pollution, alleviated urban smog, and health benefits, resulting in fewer respiratory issues among children. Additionally, China 6 requires enhanced OBD diagnostic systems, making it easier to detect and repair vehicle faults, thus simplifying maintenance. When buying a new car, I recommend skipping China 5 inventory and opting directly for China 6b models, which align with future policy trends. Given the varying implementation schedules across regions, staying informed about the latest updates can save both hassle and money.

[NadiaLynn]

The upgrade from China 5 to China 6 involves multiple technical aspects, with the key point being the innovation in testing methods. The old China 5 used laboratory testing, while the new China 6 incorporates real driving emission measurements to ensure continuous and effective emission control. Pollutant limits have been reduced by 40%-50%, with stricter requirements for particulate matter, forcing automakers to adopt new after-treatment systems to meet standards. These changes slightly increase vehicle costs but align with global standards, resulting in smoother and more environmentally friendly driving, making it a worthwhile investment.

[DeVincent]

From a societal perspective, the biggest difference between China 6 and China 5 is stronger policy-driven enforcement. China 5 only covered basic standards, while China 6 implements more detailed whole-chain controls to support national carbon reduction goals. The staggered implementation timeline avoids disruptive one-size-fits-all measures, facilitating long-term green transition for the industry. Consumers should note this to avoid purchasing outdated vehicles that may affect usability.