The present invention is a system for dynamic determination of an environmental footprint linked to the overall mobility of a user, comprising means for measuring a trip made by the user using a smart phone application which detects modes of mobility and modes of mobility in a motorized vehicle and style of driving; means for calculating a pollution footprint of the user, accounting for the real usage and global and local pollutants emitted during a given time interval using a server or onboard electronics in a control unit or in a connected vehicle; and means for exploiting the pollution footprint, including a connected object informing one of the user and the administrative authorities of the pollution footprint.