What is the difference between National V and National VI?

[HarmonyLynn]

National V and National VI differ in sulfur content: the maximum sulfur content for National V standard gasoline is 10mg per kilogram; for National VI standard gasoline, it is 50mg per kilogram. Both National V and National VI are vehicle emission standards. Vehicle emissions refer to harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides, particulate matter, and soot discharged from exhaust gases, all of which are produced during the engine's combustion process. OBD, translated as On-Board Diagnostics, is a system that continuously monitors the engine's operating conditions to check if the vehicle's emissions exceed standards. If they do, it will immediately issue a warning.