What are the methods to distinguish between National 5 and National 6 standards?
2 Answers
National 5 and National 6 standards can be distinguished by: 1. Logging into the Motor Vehicle Environmental Protection Network for inquiry; 2. Inquiring at the Vehicle Management Office; 3. Checking the vehicle's environmental protection label; 4. Reviewing the vehicle's factory certificate. National 5 and National 6 refer to standards established to implement the Environmental Protection Law of the People's Republic of China and the Air Pollution Prevention and Control Law of the People's Republic of China, aiming to prevent and control pollution from exhaust emissions of compression-ignition and gas-fueled spark-ignition engine vehicles, protect the ecological environment, and safeguard human health. The differences between National 5 and National 6 include: 1. Different nitrogen oxide (NOx) emission standards: National 5 sets the NOx emission standard at 0.18 grams per kilometer, while National 6 sets it at 0.16 grams per kilometer. 2. Different particulate matter (PM) concentration emission standards: National 5 sets the PM emission standard at 0.0045 grams per kilometer, whereas National 6 sets it at 0.022 grams per kilometer. 3. Different non-methane hydrocarbon (NMHC) emission standards: National 5 sets the NMHC emission standard at 0.23 grams per kilometer, while National 6 sets it at 0.18 grams per kilometer.
As an experienced driver who has driven many cars, I mainly distinguish between China 5 and China 6 standards through several practical points. The environmental protection label on the rear of the car directly shows whether it's marked as China V or China VI. The manufacturing date also helps me judge—most China 5 cars were produced before 2017, while China 6 cars became more common after 2019. In terms of emissions, China 6 is significantly stricter, with pollutant limits reduced by several percentage points, such as nitrogen oxides. Additionally, when driving, China 6 cars are equipped with better fuel systems, resulting in slightly more stable fuel consumption compared to older China 5 cars, which tend to fluctuate more. When choosing a car, I also pay attention to the certification information to ensure clarity and peace of mind. Overall, checking these aspects usually makes it clear, and when in doubt, I take a photo of the label and ask a car-savvy friend to verify.
