The spanish Directorate General for Traffic has established a classification system for the city's vehicles with the aim of positively discriminating in favour of the most environmentally-friendly vehicles and introducing an effective tool in municipal policies, both for imposing driving restrictions during high-pollution episodes, and for promoting new technologies through tax incentives or benefits relating to mobility and the environment.
There are five categories of vehicles, according to their potential for pollutant emissions:
- B.
- C.
- Eco.
- Zero Emissions.
- Without Label.
Check your vehicle's environmental label at this link

B(yellow label)
Family cars and lightweight commercial vehicles, classified in the Vehicle Registry as petrol-driven with a Euro 3/III emissions level, or diesel-driven with Euro 4/IV or Euro 5/V. Vehicles with more than eight places and for transporting goods, classified in the Vehicle Registry as Euro 4/IV or Euro 5/V without regard to the type of fuel. Euro 2 motorcycles and mopeds.

C(green label)
Family cars and lightweight commercial vehicles, classified in the Vehicle Registry as petrol-driven with a Euro 4/IV, 5/V or 6/VI emissions level, or diesel-driven with Euro 6/VI Vehicles with more than eight places and for transporting goods, classified in the Vehicle Registry as Euro 6/VI without regard to the type of fuel. Euro 4 and Euro 3 motorcycles and mopeds.

ECO(blue and green label)
Family cars and lightweight commercial vehicles classified in the Vehicle Registry as a plug-in hybrid with a range of
Vehicles with more than eight seats and for transporting goods, classified in the Vehicle Registry as plug-in hybrids with a range of
Motorcycles and mopeds with an HEV or PHEV category and a range of under 40 km.

Zero emissions (blue label)
Vehicles classified in the Vehicle Registry as battery powered (BEV), electric vehicles with an extended range (REEV), plug-in hybrids (PHEV) with a minimum range of 40 km or a fuel-cell vehicle.
Without environmental label
Vehicles which fail to meet the minimum environmental requirements will not receive a DGT label. These are the vehicles that are most affected by mobility restriction or prohibition measures. Petrol-driven family cars before Euro 3 and diesel-driven family cars before Euro 4. Euro 1 motorcycles and mopeds.