What is the national emission standard for IV?
2 Answers
National IV is the China 4 emission standard. The numeral 'IV' is a Roman numeral, corresponding to the Arabic numeral '4', hence National IV is the China 4 standard. Below is relevant information about National IV: 1. The China 4 emission standard is the fourth-stage national standard for motor vehicle pollutant emissions, requiring the sulfur content in gasoline to not exceed 50mg/kg, with low sulfur content. 2. Major automotive emission pollutants include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), PM (particulate matter), etc. Through the application of technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, these pollutants are controlled and reduced to levels below specified standards.
I've been running an auto repair shop for over a decade. China IV is China's fourth-stage emission standard for vehicles, mainly regulating the amount of pollutants in exhaust emissions. It was implemented back in 2008, and there are still many vehicles on the road meeting this standard. In big cities like Beijing and Shanghai, older China IV vehicles might face driving restrictions, such as being banned from entering the inner ring roads. If you want to check your vehicle's emission standard, just look at the number on the environmental label - China IV vehicles are marked with IV. It's better for the environment, but lags behind China VI standards, reducing nitrogen oxide emissions somewhat, though with lower technical thresholds. They're quite common in the used car market. Don't worry, with proper maintenance, they can still run for several more years.
