What is the China IV Emission Standard?
3 Answers
The China IV Emission Standard is the fourth phase of national standards for motor vehicle pollutant emissions. The main pollutants emitted by vehicles include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (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 limits. Compared to previous standards, the China V standard imposes stricter limits on nitrogen oxides, hydrocarbons, carbon monoxide, and suspended particles. From China I to China IV, each upgrade in the standard reduces single-vehicle pollution by 30% to 50%.
The China IV emission standard is a regulation introduced by the government to control vehicle exhaust pollution. As an ordinary driver who has been using an old car for over a decade, I personally experienced its implementation phase. It was roughly rolled out around 2008 and fully enforced by 2010, primarily targeting emission limits for gasoline and diesel vehicles, requiring significant reductions in harmful substances like carbon monoxide, nitrogen oxides, and hydrocarbons. Compared to the looser China III standards, the introduction of China IV prompted many automakers to upgrade their technologies, such as installing three-way catalytic converters. I had to regularly use high-quality fuel and maintain the exhaust system, otherwise, the annual inspection might fail. This standard has helped improve urban air quality, reduced smog, and raised public awareness about the importance of eco-friendly transportation. In the long run, China IV was a crucial step paving the way for China V and China VI standards. Although older vehicles faced compatibility challenges, the overall environmental benefits have been substantial.
As an auto enthusiast, I really enjoy discussing the technical highlights of China's National IV emission standards, which are essentially the country's fourth-phase emission regulations. Simply put, starting from 2008, all new vehicles must comply with stricter exhaust pollution limits – for instance, nitrogen oxide emissions must be reduced by over 30% compared to the more lenient National III standards. This forced automakers to install advanced systems like EGR (Exhaust Gas Recirculation) and OBD (On-Board Diagnostics) to reduce black smoke and particulate emissions. As a car enthusiast, I've found maintaining these components is crucial – a faulty catalytic converter will cause emissions to exceed limits and affect inspection results. The National IV standards pushed China's auto market toward cleaner development, somewhat similar to the international Euro IV standards. Though implementation posed challenges, technological advancements have made driving more environmentally friendly.
