What are the differences between 6b and 6a vehicles?

1 Answers
JanelleFitz
07/29/25 10:18pm
The differences between 6b and 6a vehicles are as follows: 1. Carbon monoxide: 6a does not exceed 700 milligrams; 6b does not exceed 500 milligrams. 2. Non-methane hydrocarbons: 6a does not exceed 8 milligrams; 6b does not exceed 35 milligrams. 3. Nitrogen oxides: 6a does not exceed 60 milligrams; 6b does not exceed 35 milligrams. 4. PM fine particles: 6a does not exceed 4.5 milligrams; 6b does not exceed 3 milligrams. For China 6A and China 6B, the plan is to implement them nationwide uniformly on July 1, 2020, and July 1, 2023, respectively.
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