What does the National V vehicle emission standard mean?

[DelilahAnn]

Automotive emission standard National V refers to the fifth stage of national motor vehicle pollutant emission standards, abbreviated as "National V standard". The emission control level of the National V standard is equivalent to the fifth stage emission standard currently implemented in Europe. The National V standard imposes more stringent restrictions on motor vehicle emissions such as nitrogen oxides, hydrocarbons, carbon monoxide, and suspended particles. Vehicle emissions refer to harmful gases discharged from exhaust, including CO (carbon monoxide), HC plus NOx (hydrocarbons and nitrogen oxides), PM (particulates, soot), etc., all of which are harmful gases produced during the engine combustion process.