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What is the national emission standard for IV?

1 Answers
GenevieveFitz
07/30/25 2:13am
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.
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