How to Identify the National Emission Standard of a Vehicle?

[KeiraRose]

Methods to identify the national emission standard of a vehicle: 1. Check the vehicle's environmental protection compliance label or the first page of the vehicle certification; 2. Search online for 'motor vehicle environmental protection' and visit the relevant website for inquiries; 3. The owner can take the vehicle's registration certificate (a photocopy is acceptable) to the environmental protection window at the vehicle management office for inquiry; 4. Estimate the vehicle's emission standard based on the production year: Vehicles produced after September 2009 are National Standard 4 (NS4), those produced between July 2007 and September 2009 are National Standard 3 (NS3), and those produced between July 2004 and July 2007 are National Standard 2 (NS2). Vehicle emission standards regulate the permissible levels of harmful gases emitted from vehicle exhaust, including CO (carbon monoxide), HC+Nox (hydrocarbons and nitrogen oxides), and PM (particulate matter, soot).