What are China IV and China V standards?

[LeTessa]

China IV refers to National Standard 4, and China V refers to National Standard 5. When both appear simultaneously, it indicates that the vehicle meets two different emission standards, as manufacturers produce specific versions for different regions. In cities requiring China IV standards, vehicles compliant with China IV are released, while in cities with China V standards, China V-compliant models are offered. The China IV emission standard represents the fourth phase of national motor vehicle pollutant emission standards, while China V is equivalent to the Euro V standard. Compared to China IV, China V features stricter requirements for nitrogen oxides, total hydrocarbons and nitrogen oxides, and particulate matter concentration. Additionally, China V introduces standards for particulate matter particle count and hydrocarbons excluding methane.