The use of CNG/hydrogen blends represents a key step toward the use of pure hydrogen. Using technologies developed for large scale application to CNG, emissions of CO2, hydrocarbons, carbon monoxide and nitrogen oxides can be reduced significantly. During 2009, development was completed on an experimental fleet for the Region of Lombardy, consisting of 20 Fiat Pandas (Natural Power) which run on a blend of 30% hydrogen and 70% CNG (by volume). During the trial, a data acquisition system on board each vehicle will collect the necessary data to monitor the correct functioning of the vehicles and record the level of fuel consumption and CO2 emissions. Research into CNG/hydrogen blends also includes development of a Hydromethane EcoDaily as part of an experimental programme with Autostrada del Brennero S.p.A. This project represents a further step towards sustainable mobility, as the hydrogen used in the blend is produced from the energy surplus of a hydroelectric power plant.