Cities across Europe need to improve the quality of their air – and fast. More and more city and regional authorities are turning to fuel cell technology, which offers an emission-free alternative for use in vehicle fleets, heat generation and industrial processes. Hydrogen is the fuel that powers the technology. A recent Roland Berger study found that some 90 European cities are investing close to EUR 1.8 billion in this future technology over the coming five years. The necessary infrastructure is already being put in place, but the car industry in particular is still lagging behind, not yet building hydrogen vehicles in sufficient numbers.