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An evaluation of emission levels and fuel consumption of urban hybrid vehicles has been performed. Both heavy and light duty vehicles have been considered and a comparison on specific consumptions and emissions has been carried out between the hybrid and traditional configurations. The battery behavior during charge and discharge transients has been taken into account because it is one of the most critical elements of hybrid systems. The results of this investigation indicate the possibility to reach significant reductions of consumption and emissions through the adoption of hybrid systems for urban transports.