What does the automotive emission standard IV mean?
2 Answers
Automotive emission standard IV refers to the National Phase IV Motor Vehicle Pollutant Emission Standard. The main pollutants emitted by vehicles include HC, NOx, CO, PM, etc. 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 to levels below specified limits. The full name of the National IV standard is the National Phase IV Motor Vehicle Emission Standard, which is equivalent to the European Euro IV standard. In terms of emission control, vehicles meeting the National IV standard must reduce pollutants by an additional 30% to 50% compared to the National III standard to comply.
Emission Standard IV in automobiles typically refers to the China IV standard, which represents the fourth phase of national limits on vehicle pollutant emissions. This standard primarily targets harmful gases in exhaust, such as carbon monoxide, nitrogen oxides, and particulate matter, requiring both new and used vehicles to control emissions within specified ranges to be roadworthy. I've heard some experienced drivers mention that China IV was significantly stricter than the previous China III standard. Around 2008, when it was implemented in China, many older models like the Santana had to be phased out or required engine system modifications to meet the requirements. If your vehicle fails the annual inspection, it might be due to non-compliance with this standard. To meet China IV, manufacturers adopted technologies like three-way catalytic converters to reduce air pollution. Cleaner air makes driving more pleasant, so it's advisable to choose newer models meeting China V or higher standards when purchasing a car now.
