Does V Represent Five or Four?

[JaceFitz]

V represents five. Below are the specific details of automotive emission standards: 1. China III Emission Standard: Implementation times were July 1, 2009, for light-duty diesel vehicles; July 1, 2010, for heavy-duty gasoline vehicles; and July 1, 2008, for heavy-duty gas vehicles and heavy-duty diesel vehicles. 2. China IV Emission Standard: Nationwide implementation times were July 1, 2013, for light-duty diesel vehicles and heavy-duty gasoline vehicles; January 1, 2011, for heavy-duty gas vehicles; and July 1, 2013, for heavy-duty diesel vehicles. 3. China V Emission Standard: The nationwide implementation of the China V emission standard began on July 1, 2017, which reduces nitrogen oxide emissions by 25% compared to the China IV standard and introduces stricter PM emission limits. 4. China VI Emission Standard: The China VI standard will be divided into two phases, 6A and 6B. The first phase, starting from July 1, 2020, prohibits the sale, registration, and licensing of vehicles below the 6A emission standard. The second phase, starting from July 1, 2023, prohibits the sale, registration, and licensing of vehicles below the 6B emission standard.