How to Write China 6?

[MadelineLee]

China 6 should be represented as China VI. It refers to the National Sixth Stage Emission Standards for Motor Vehicle Pollutants. More relevant information is as follows: 1. This representation does not use Arabic numerals or English letters but Roman numerals. The sequence of Roman numerals is I, II, III, IV, V, VI, VII, VIII, IX, X, corresponding to the Arabic numerals 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Accordingly, the formal representation of China 6 is China VI. 2. China 6 is the National Sixth Stage Emission Standards for Motor Vehicle Pollutants. The Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine recently jointly issued the 'Limits and Measurement Methods for Emissions from Light-duty Vehicles (China Sixth Stage)' (hereinafter referred to as the 'Light-duty Vehicle China 6 Standard'), announcing the emission requirements and implementation timeline for the sixth stage of light-duty vehicles.