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What are the methods to distinguish between National 5 and National 6 standards?

1 Answers

MacReese

07/29/25 8:03pm

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.

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