What is the China IV Emission Standard?
2 Answers
China IV Emission Standard is the national fourth-stage standard for motor vehicle pollutant emissions. The main pollutants emitted by vehicles include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). Through the application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, this standard controls and reduces vehicle emissions to levels below specified limits. The China IV Emission Standard was established to implement environmental protection laws, reduce and prevent pollution from vehicle exhaust, protect the ecological environment, and safeguard human health.
I remember when the China IV emission standards were implemented, it was all over my social media feeds. China IV is actually the national fourth-stage motor vehicle pollutant emission standards, which were enforced for diesel vehicles starting from July 1, 2013, while gasoline vehicles had to comply two years earlier. Specifically, it significantly tightened emission limits – for instance, nitrogen oxide emissions were reduced by about one-third compared to the China III standards. It also mandated that all new vehicles must be equipped with an OBD system for real-time exhaust monitoring. The most noticeable change was the update in gasoline grades at our filling stations – they all switched to 97-octane gasoline blended with ethanol back then. Veteran drivers said the new fuel ran much cleaner. Nowadays, urban traffic restriction policies refer to these standards to determine which vehicles are allowed in city centers.
