What is China IV Emission Standard?
2 Answers
China's fourth-stage motor vehicle pollutant emission standard, abbreviated as "China IV Emission Standard." The main pollutants emitted by vehicles include HC, NOx, CO, PM, etc. Through the application of technologies such as the active layer of catalytic converters, secondary air injection, and exhaust gas recirculation systems with cooling devices, the standard aims to control and reduce vehicle emissions below specified limits. Below are the implementation timelines for the emission standards: 1. China I Standard: Nationwide implementation on July 1, 2001, primarily targeting restrictions on carbon monoxide, hydrocarbons, and particulate emissions. 2. China II Standard: Nationwide implementation on July 1, 2004, requiring a 30% reduction in carbon monoxide and a 55% reduction in hydrocarbons and carbon oxides. 3. China III Standard: Nationwide implementation on July 1, 2007, requiring a 40% reduction in total pollutant emissions compared to China II. 4. China IV Standard: Nationwide implementation on July 1, 2010, requiring a 50% to 60% reduction compared to China III. 5. China V Standard: Nationwide implementation on January 1, 2018, requiring a 25% reduction in nitrogen oxide emissions compared to China IV. 6. China VI Standard: China VIa nationwide implementation on July 1, 2020, and China VIb nationwide implementation on July 1, 2023.
I only learned about the China IV emission standard when I bought a used car two years ago. Simply put, it's the national control standard for motor vehicle exhaust pollutants, equivalent to the fourth-phase requirements. It was first implemented in 2010 and is much stricter than the previous China III standard, requiring a 50% reduction in hydrocarbons and a 30% reduction in nitrogen oxides emitted by vehicles. The most direct impact for us ordinary car owners is that China IV vehicles require China IV standard gasoline; otherwise, the engine can be easily damaged. Nowadays, many places have restrictions on China IV vehicles, such as some cities prohibiting them from entering urban areas during morning and evening rush hours. My family's 2012 old car is China IV compliant, and during annual inspections, the exhaust emission tests are particularly strict—ensuring the catalytic converter and oxygen sensors are functioning properly is a must.
