How to Distinguish Between National 5 and National 6 Emission Standards for Vehicles?
3 Answers
Distinguishing between National 5 and National 6 emission standards for vehicles can be done through the following methods: 1. Check the vehicle's factory certificate; 2. Review the vehicle's environmental standard list; 3. Examine the vehicle's conformity certificate. The differences between National 5 and National 6 are: 1. Different carbon monoxide emissions: National 5 allows 1000mg; National 6 allows 700mg. 2. Different emission limits: National 5 has an emission limit of 0.0045 grams per kilometer; National 6 has an emission limit of 0.25 grams per kilometer. National 5, officially known as the National Fifth Stage Motor Vehicle Pollutant Emission Standard, and National 6, officially known as the National Sixth Stage Motor Vehicle Pollutant Emission Standard, both regulate the content of harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides, particulates, and soot emitted from vehicle exhaust.
When it comes to distinguishing between China 5 and China 6 vehicles, my research on automotive technology reveals that the most straightforward method is to check the emission label. The environmental protection sticker on the windshield of a new car clearly indicates whether it's China 5 or China 6. Secondly, inspect the vehicle conformity certificate or the environmental information list that comes with the car. China 6 models require more stringent emission tests, such as the addition of real-world driving monitoring systems, which involve exhaust treatment devices like Diesel Particulate Filters (DPF) to effectively reduce soot emissions. China 6 is further divided into Phase A and Phase B, with Phase B having higher standards and lower pollutant limits. Some China 6 engines feature smarter OBD diagnostics that can monitor data in real-time. My advice is not to rely solely on the salesperson's word when buying a car; verify the documents or VIN code yourself. Opting for China 6 isn't just about being eco-friendly—it also helps avoid driving restrictions in major cities.
As an ordinary car owner, I've noticed significant differences between China V and China VI standards during years of driving. The most obvious is fuel requirements - China VI vehicles recommend using China VI standard gasoline to reduce particulate emissions, otherwise the system tends to trigger warnings. During annual inspections, China VI vehicles face stricter testing due to much lower emission limits. The identification method is simple: the new vehicle certificate or registration document clearly marks whether it's China V or VI. Without documentation, check the engine model - China VI engines often carry more advanced codes. China VI exhaust systems are quieter but have slightly higher maintenance costs, as aftertreatment components like catalytic converters are more complex. When choosing a car, prioritize China VI models for both peace of mind and environmental benefits.
