There are high hurdles to be taken before the environmental label "Blue Angel" can be awarded. For example, all-electric buses have to demonstrate a minimum capacity for their high-voltage batteries. Further prerequisites include a guarantee of at least five years or mileage of 200,000 kilometres on the batteries, the opportunity to return them at a later date, non-destructive battery change and the availability of replacement components for up to ten years after production has ended. In addition to this, the proportion of heavy metals in batteries is strictly limited.
The requirements also cover the overall vehicle's environmental criteria. In paints and coatings, for instance, no lead, chromium oxide or cadmium compounds are permitted. As of the start of this year, only natural refrigerants are permitted for air conditioning systems. The eCitaro meets this criterion with its CO2 air conditioning system. It goes without saying that the fully-electric eCitaro adheres to tight threshold values for driving noise.