What are the differences between National IV and National VI vehicles?

[LaMartin]

Here are the differences between National IV and National VI vehicles: Different restrictions: The sulfur content limit for National IV is 50ppm; The sulfur content limit for National VI is 5ppm. Different fuel principles: During the National IV phase, diesel and gasoline vehicles had different emission standards; National VI adopts a fuel-neutral principle, meaning the same emission limits apply regardless of fuel type. Different emission standards: Compared to National III, National IV reduced nitrogen oxide emissions by 30% for light-duty vehicles and 50% for heavy-duty vehicles; Compared to National V, National VI reduces particulate emissions by 40%, and for heavy-duty diesel vehicles, nitrogen oxides and particulates will be 60% lower than National V standards.