What is China IV in terms of national emission standards?
2 Answers
China IV refers to the National IV emission standard. The term 'China IV' indicates that the vehicle's engine system and emission standard tests are configured to be compatible, making it a transitional vehicle model. The sulfur content limit for National IV standard gasoline is 150 milligrams per kilogram. Currently, light-duty diesel vehicles comply with the Phase III emission standard, while light-duty gasoline vehicles adhere to the Phase IV emission standard. The National IV emission standard represents China's fourth-stage standard for controlling pollutants emitted by motor vehicles. Major automotive pollutants include hydrocarbons, nitrogen oxides, carbon monoxide, and 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, the standard aims to control and reduce vehicle emissions below specified thresholds.
China IV actually refers to the fourth-stage emission standard for vehicles, commonly known as the China 4 standard. I remember when I first bought a car, my first one was a China 4 vehicle, which was over ten years ago. At that time, emission regulations were not as strict, and China 4 cars were quite common, mainly limiting pollutants like carbon monoxide and nitrogen oxides. Later, the country continuously raised the standards, and now it has been upgraded to China 6. Many places have restrictions on China 4 vehicles, such as not being allowed to enter urban areas. If you're looking at cars in the used car market now, China 4 vehicles might be cheaper, but you should be cautious about traffic restrictions. It's advisable to check local regulations before making a decision. In short, emission standards are updated quickly, and older cars need proper maintenance.
