Intelligent Transportation Systems are expected to contribute to reduce vehicle emissions. Solutions include user behavior changes, which are typically vehicle sharing programs and driving habits changes. To change driving habits, people need personalized feedback on their vehicle emissions in the routes they complete. In this work, we present a smartphone based system that returns a geopositioned emission estimation on the fly. Our estimator is based on the ARTEMIS project results. The system has been successfully tested in different routes in Malaga (Spain) in highway, rural and urban areas.