How to distinguish between National IV and National V vehicles?

[Pearl]

Regarding the differences between National IV and National V standards, the following points apply: 1. Different nitrogen oxide emissions: Compared to National IV, the National V standard reduces nitrogen oxide emissions by 25% for light-duty vehicles and 43% for heavy-duty vehicles. Additionally, National V introduces standards for particulate matter particle count (PN) and non-methane hydrocarbons (NMHC). 2. Different implementation times: The National IV standard was implemented nationwide on July 1, 2010, featuring upgrades to emission after-treatment systems and fuel quality. The National V standard was implemented nationwide on January 1, 2018, aimed at reducing atmospheric pollution and preventing smog.