How to Distinguish the National Emission Standard Symbols?

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Methods to distinguish the national emission standard symbols: V represents National V (China 5). If I is on the left side of V, it means five minus one; if I is on the right side of V, it means five plus one. For example, National IV is China 4, and National VI is China 6. Relevant details are as follows: Currently, the National 6a emission standard is being implemented, which is a transitional standard used during the shift from National 5 to National 6. The National 6a standard specifies: 1. Carbon monoxide: Gasoline vehicles must not emit more than 700 milligrams of carbon monoxide per kilometer driven. 2. Non-methane hydrocarbons: Gasoline vehicles must not emit more than 68 milligrams of non-methane hydrocarbons per kilometer driven. 3. Nitrogen oxides: Gasoline vehicles must not emit more than 60 milligrams of nitrogen oxides per kilometer driven. 4. PM fine particles: Gasoline vehicles must not emit more than 4.5 milligrams of PM fine particles per kilometer driven.