What does National V engine refer to?

[JourneyLee]

National V engine refers to compliance with the National Phase V vehicle pollutant emission standards, also known as "National V Standard". The emission control level of the National V Standard is equivalent to the European Stage 5 emission standard currently in effect. It imposes more stringent limits on vehicle emissions such as nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO), and particulate matter (PM) compared to previous standards. In comparison with the National IV Standard, the National V Standard reduces nitrogen oxide emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles. Based on Shanghai's annual vehicle registration volume of approximately 350,000 units, it is estimated that the annual increase in new vehicles could reduce nitrogen oxide emissions by about 1,000 tons per year.