What are the symbols for National Emission Standards I, II, III, IV, V, and VI?
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The symbols for National Emission Standards I, II, III, IV, V, and VI are represented by Roman numerals: I-1, II-2, III-3, IV-4, V–5, VI-6, VII. China's standards: Compared with advanced foreign countries, China's automobile exhaust emission regulations started late and were at a lower level. Based on China's actual situation, a phased implementation plan was adopted starting from the early 1980s, proceeding from easier to more difficult measures. The specific implementation has mainly been divided into three stages to date. Definition of automobile emissions: Automobile emissions refer to harmful gases such as CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulates, soot) discharged from exhaust. These are all harmful gases produced during the engine's combustion process.