What are the criteria for identifying yellow-label vehicles?

[WestonLee]

Yellow-label vehicles are identified based on their exhaust emission standards. The term 'yellow-label vehicle' collectively refers to gasoline vehicles with emission levels below China's National I standard and diesel vehicles below the National III standard when they were first manufactured. These are typically vehicles with high pollution output, concentrated emissions, and poor emission stability. Additional information: Environmental protection labels are divided into green and yellow categories. Gasoline vehicles that meet the National I or higher emission control requirements and standard limits upon initial registration, as well as diesel vehicles compliant with National III standards or above, are issued green environmental labels. All other vehicles receive yellow environmental labels (i.e., yellow-label vehicles).