Classification labels pollution by bike

Depending on pollutant emissions generated by the motorcycle corresponding one of the four types different classifications of environmental labels:
- ZERO: electric motorcycles with more than autonomy 40 km.
- ECO: electric motorcycles with less autonomy 40 km.
- C: Motorcycles homologated under the Euro standards 4 and Euro 3.
- B: Motorcycles homologated under the Euro standard 2.