What does China National V and China National VI mean for vehicles?

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China National V and China National VI refer to vehicle exhaust emission standards, indicating compliance with either the National V or National VI emission standards. Below is a detailed introduction to the China National V and VI emission standards: Implementation of China National VI emissions: The China National VI standard will be divided into two phases: 6A and 6B. The first phase begins on July 1, 2020, prohibiting the sale, registration, and licensing of vehicles that do not meet the 6A emission standard. The second phase starts on July 1, 2023, prohibiting the sale, registration, and licensing of vehicles that do not meet the 6B emission standard. China National VI imposes stricter requirements compared to National V: Excluding the influence of driving conditions and testing, the carbon monoxide emissions of gasoline vehicles are reduced, and the emission limits for total hydrocarbons and non-methane hydrocarbons are lowered by 50%, while the nitrogen oxide emission limits are tightened by 42%.