What is the National Standard IV for Vehicle Emissions?

[VanRemington]

Automotive National Standard IV refers to China IV emission standards, fully known as the National Fourth Stage Motor Vehicle Pollutant Emission Standards. The main pollutants from vehicle emissions include hydrocarbons, nitrogen oxides, carbon monoxide, and particulate matter. These pollutants are filtered through the active layer of catalytic converters, secondary air injection, and exhaust gas recirculation systems equipped with cooling devices to control and reduce vehicle emissions below specified limits. Implementing vehicle exhaust emission standards can effectively control the release of pollutants, reduce air pollution, protect the natural environment, and minimize health hazards.