What are the differences between National IV, National V, and National VI?

[MacIsabel]

The differences between National IV, National V, and National VI are that the later standards impose stricter emission requirements. Additionally, the standards for nitrogen oxides (NOX), the combined total of hydrocarbons and nitrogen oxides (HCNOX), and particulate matter (PM) concentrations have been raised. Compared to National IV, National V requires a 25% reduction in nitrogen oxide emissions, while National VI demands a reduction of over 50% compared to National V. In terms of particulate matter, National VI reduces emissions by 42% compared to National V, making the National VI standard significantly more stringent than National V. Additional information: 1. Vehicle Emission Standards: Vehicle emission standards are national regulations designed to limit the production of harmful gases such as CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulate matter, soot) emitted from vehicle exhaust. 2. Standard Classification: China's motor vehicle pollutant emission standards are largely equivalent to the European Union's emission standards, hence the similar terminology is used domestically. However, there are still some technical differences between the two. China's "Limits and Measurement Methods for Emissions from Light-Duty Vehicles (I)" is equivalent to the "Euro I" standard, while "Limits and Measurement Methods for Emissions from Light-Duty Vehicles (II)" is equivalent to the "Euro II" standard.