What are the vehicle exhaust emission standards?
1 Answers
Vehicle emission standards refer to the regulations on the content of harmful gases such as CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulates, soot) emitted from vehicle exhaust. In 2001, China introduced the China Phase I emission standard by referencing European emission standards, followed by China II, China III, China IV, China V, and China VI. Currently, the vehicle exhaust emission standard in China is the China VI standard. The new China VI standard is implemented in two phases. The first phase started on July 1, 2020, and the second phase began on July 1, 2023. These are the latest nationwide implementation time requirements, with specific times varying slightly by province. For example, the draft opinion on the Beijing China VIB implementation standard shows that heavy-duty diesel vehicles such as buses and sanitation vehicles were required to comply starting July 1, 2019, while other vehicles had to comply from January 1, 2020. Shanghai officially announced the China VIB implementation date as July 1, 2019. Hebei Province also implemented the China VI emission standard for motor vehicles starting July 1. Other details about exhaust emission standards are as follows: The China IV vehicle exhaust emission standard refers to the National Phase IV Motor Vehicle Pollutant Emission Standard. Vehicle emission pollutants mainly include hydrocarbons, nitrogen oxides, carbon monoxide, and particulates. 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 controls and reduces vehicle emission pollutants below specified levels. The China V vehicle exhaust emission standard is equivalent to the EU's Euro 5 standard, which the EU began implementing in 2009. It imposes stricter limits on vehicle emissions such as hydrocarbons, nitrogen oxides, carbon monoxide, and suspended particles. From China I to China V, each upgrade in the standard reduces single-vehicle pollutants by 30% to 50%. Compared to the China V emission standard, the China VI emission standard is more stringent in terms of testing standards and pollutant emissions. The test cycle was changed from NEDC to WLTC standards, and real-world driving emission tests were added. The pollutant limits are stricter, with China VI being 40% to 50% more stringent than China V. The CO and HC limits are one-third stricter compared to China V.
