When did the China 4 emission standard start?

[DiMaggie]

The China 4 emission standard started in 2011. The China 4 emission standard is the national fourth-stage emission standard. Vehicle emission standards regulate the content of harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides, particulate matter, and soot emitted from vehicle exhaust. Methods to check a vehicle's emission standard include: 1. Check the vehicle conformity certificate: The vehicle's emission standard is clearly stated in the conformity certificate; 2. Look for the vehicle's accompanying documents: The emission standard can be found in the vehicle information section; 3. Check the conformity of production certificate: It indicates the corresponding emission standard; 4. Inspect the vehicle's environmental protection label: There is a clear mark on the back of the environmental protection label on the vehicle's front windshield, indicating the vehicle's emission standard.