Which Years Do National IV Emission Standard Vehicles Cover?

[OAlexandra]

Vehicles produced after 2011 generally comply with National IV standards. Compared to National III, National IV upgraded the exhaust after-treatment system, reducing pollutant emissions by 50% to 60% relative to National III. Introduction to Emission Standards: 1. China's emission standards are primarily based on European Union standards with adaptive modifications. 2. China has currently implemented National VI emission standards, which represent stricter requirements compared to National V. 3. The National VI standard is implemented in two phases: National VIa and National VIb.