What are the differences between China 4 and China 5 standards?
2 Answers
The difference between China 4 and China 5 standards lies in the upper limit of sulfur content: the sulfur content limit for China 4 standard gasoline is 10mg, while for China 5 standard gasoline, it is 50mg. China 5 imposes stricter controls on nitrogen oxides compared to China 4, with China 5 setting the emission limit at 25%. The China 4 emission standard is the fourth stage of national motor vehicle pollutant emission standards. The main pollutants emitted by vehicles include HC, NOx, CO, PM, etc. These are controlled through technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices.
The biggest difference between China IV and China V is the stricter emission standards. China V was fully implemented in 2017, about three or four years later than China IV. It mainly tightened the emission limits for nitrogen oxides and particulate matter, simply put, making vehicle exhaust cleaner. When I changed my car the year before last, I specifically checked that China V vehicles must be equipped with more complex exhaust treatment devices, such as adding devices that actively adsorb particulate matter, so the cost of new cars will be higher. Also, China V-specific fuel must be used, which has much lower sulfur content than China IV fuel, thus extending the life of the exhaust system. Additionally, many big cities like Beijing and Shanghai now restrict China IV vehicles from entering the city, while China V vehicles basically don't have these restrictions, which is particularly important for us drivers.
