How to Write China 6?

[DavidAnn]

China 6 can be written as: China VI, which stands for the National Sixth Stage Emission Standard for Motor Vehicles. The details are as follows: 1. VI is a Roman numeral. The sequence of Roman numerals is I, II, III, IV, V, VI, VII, VIII, IX, X. 2. The corresponding Arabic numerals for Roman numerals are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Here is some extended information about China 6: 1. Starting from July 1, 2020, the relatively lenient "China 6a phase" standard was implemented. 2. Starting from July 1, 2023, the stricter "China 6b phase" standard was implemented. The China 6 emission standard is 40%-50% stricter than China 5, surpassing the Euro 6 standard and being on par with U.S. standards, making it one of the strictest emission standards globally. 4. Under the China 6a standard, the CO limit for gasoline vehicles is tightened by 30%; under the China 6b standard, the CO and NOx limits for gasoline vehicles are tightened by 50% and 42%, respectively. To meet the new standards, vehicles have undergone improvements such as enhancing catalysts in catalytic converters (e.g., increasing precious metal content), optimizing fuel injection methods, upgrading ECU units, and improving OBD systems.