What does China 6b mean for vehicles?

1 Answers
SanJameson
07/29/25 3:32pm
China 6b refers to the second phase of the China 6 emission standards. According to the plan, the "China 6" standard will be implemented in two phases: China 6a and China 6b. The first phase started on July 1, 2020, prohibiting the sale, registration, and licensing of vehicles that do not meet the China 6a emission standard. The second phase, starting from July 1, 2023, prohibits the sale, registration, and licensing of vehicles that do not meet the China 6b emission standard. More details are as follows: 1. The "China 6" standard is an upgrade from the China 5 standard. Compared to the "China 5" standard, "China 6" will strictly control the emission limits of pollutants. The standard requires a 50% reduction in carbon monoxide emissions for gasoline vehicles, a 50% reduction in total hydrocarbons and non-methane hydrocarbon emission limits, and a 42% stricter nitrogen oxide emission limit. 2. Except for carbon monoxide and particulate number (PN), which remain unchanged, the emission standards for other gases under "China 6b" are almost twice as strict as those under "China 6a", and even more stringent compared to "China 5". The most notable change is the nitrogen oxide emission standard for diesel vehicles: the "China 5" standard was 180mg/km, while "China 6b" is 35mg/km.
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