Is VI the Character for China VI Emission Standard?

[VonIsabella]

VI is the character for China VI emission standard, which is a Roman numeral, with I–1, II-2, III-3, IV-4, V-5, VI-6. Below is a detailed introduction to the emission standards:1. Since 2001, China has implemented the China Phase I emission standard by referencing European emission standards, followed by China II, China III, China IV, and China V, with each phase imposing stricter emission requirements than the previous one. According to the normal implementation schedule, the China VI standard is divided into two phases: starting from July 1, 2020, all light-duty vehicles sold and registered must comply with the China VI standard 6a limit requirements; starting from July 1, 2023, all light-duty vehicles sold and registered must comply with the China VI standard 6b limit requirements.2. Compared to China V, the China VI emission standard is more stringent in terms of testing standards and pollutant emissions. The test cycle has been changed from NEDC to WLTC standards, with the addition of real-world driving emission tests. The pollutant limits are stricter, with China VI being 40%-50% more stringent than China V. The CO and HC limits are one-third stricter than China V. The standard introduces a 48-hour evaporation emission test and a refueling process VOCs emission test, raising the evaporation emission control level to over 90%, and introduces strict On-Board Diagnostics (OBD) control requirements similar to those in the U.S.