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What is the China VI Emission Standard?

2 Answers

GabrielaLee

07/28/25 5:01pm

China VI emission standard refers to the National Sixth Stage Emission Standards for Motor Vehicle Pollutants. It is established to prevent environmental pollution caused by exhaust emissions from compression-ignition and gas-fueled spark-ignition engine vehicles, protect the ecological environment, and safeguard human health. The China VI emission standard specifies the following limits: 1. Carbon monoxide (CO) emission content: 700mg; 2. Non-methane hydrocarbon (NMHC) emission content: 68mg; 3. Nitrogen oxides (NOx) emission content: 60mg; 4. Particulate matter (PM) emission content: 4.5mg. Methods to check if a vehicle complies with China VI standard include: 1. Vehicle environmental protection compliance label; 2. The page with the vehicle certification number; 3. Estimating the emission standard based on the vehicle's manufacturing year; 4. Querying at the local vehicle management office using the original or a copy of the motor vehicle registration certificate.

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RebeccaFitz

08/11/25 11:33pm

The China VI emission standard is China's sixth-stage vehicle pollutant emission control requirement, which is stricter than the previous China V standard and is divided into two phases: China VIa and China VIb. China VIa was implemented starting in 2020, targeting the reduction of nitrogen oxides (NOx), hydrocarbons (HC), particulate matter (PM), and other emissions for both gasoline and diesel vehicles. China VIb was fully enforced in 2023, with pollutant limits such as nitrogen oxides nearly halved, requiring vehicles to be equipped with high-efficiency after-treatment systems like three-way catalytic converters. Vehicles must also monitor emission data in real-time via OBD. Choosing a China VIb-compliant vehicle when purchasing can help avoid future licensing restrictions or depreciation risks while supporting the upgrade of eco-friendly technologies. It is recommended to regularly maintain the exhaust system and use qualified fuel to reduce carbon deposits that may affect compliance. These modifications make vehicle exhaust cleaner, contributing to improved air quality. Overall, the China VI standard reflects China's progress in automotive environmental protection.

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