What is the difference between National 5 and National 6 emission standards?

[DaniellaDella]

The differences between National 5 and National 6 emission standards are as follows: 1. Different requirements for carbon monoxide emissions: National 5 requires carbon monoxide content to be 1000mg per kilometer; National 6 requires carbon monoxide content to be 500mg per kilometer. 2. Different letter representations: National 5 is represented by V; National 6 is represented by VI. 3. Different issuing departments: The National 5 standard was issued by the Ministry of Environmental Protection; The National 6 standard was issued by the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine. Extended information: Automobile emission standards refer to regulations on the content of harmful gases such as CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulate matter, soot) emitted from vehicle exhaust.

[HectorLee]

As a seasoned driver, I've been driving a China 5 standard car for years without major issues. But after switching to a China 6 vehicle, I immediately noticed much cleaner exhaust emissions—less black smoke on the roads and slightly fresher air. The China 6 standards are significantly stricter than China 5, slashing nitrogen oxide limits by half and imposing tougher controls on particulate matter. Testing now uses real-driving simulations instead of just lab tests like China 5. Fuel consumption hasn’t changed noticeably in my China 6 car, though some parts (like upgraded batteries and catalytic converters) may cost more during maintenance. Long-term, this pushes EV development and helps reduce urban smog. However, the higher upfront cost (around 10k–20k RMB more) and faster depreciation of China 5 used cars mean buyers must weigh eco-friendliness against budget. Bottom line: emission upgrades are positive, but no rush to replace older cars.

[Brenda]

As an environmental advocate, I've been following emission differences for years. China 6 significantly improves pollutant control compared to China 5, reducing nitrogen oxides by about 50% and particulate matter even further. These changes stem from real driving tests and advanced technologies. Environmentally, it alleviates urban smog and protects respiratory health. While China 6 vehicles have higher production costs, the long-term environmental benefits are worthwhile. Compared to China 5, it promotes the adoption of green energy vehicles and reduces carbon footprints. Consumers may face slightly higher prices when purchasing, but it doesn't affect driving habits. Supporting such policies is a crucial step, and we should work together to improve the environment.

[ElizabethLee]

I've seen a lot of emission issues during car repairs. The China 6 standard is stricter than China 5, with lower pollutant limits and more realistic testing. Technically, China 6 vehicles have more efficient catalytic converters and optimized fuel systems to reduce carbon deposits. In terms of maintenance, China 5 parts are still compatible, but China 6 replacement parts might be slightly more expensive. In practice, it's not a big hassle.