How to Distinguish Between National 5 and National 6 Vehicles?

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Methods to distinguish between National 5 and National 6 vehicles: 1. Check the vehicle conformity certificate, which clearly states whether the vehicle is a National 5 or National 6 vehicle; 2. Environmental protection list, which also clearly indicates whether the vehicle is a National 5 or National 6 vehicle. The National Fifth Stage Motor Vehicle Pollutant Emission Standard, abbreviated as National 5 standard, has an emission control level equivalent to the European Union's currently implemented Euro 5 emission standard. The National Sixth Stage Motor Vehicle Pollutant Emission Standard, abbreviated as National 6 standard. Under National 5, the carbon monoxide emission limit for gasoline vehicles is no more than 1 gram per kilometer, while under National 6a, the carbon monoxide emission limit for both vehicle types must not exceed 0.5 grams per kilometer.