The present invention relates to a process for continuously monitoring, in real time and at different altitudes, airborne pollutants. In particular, by using a multi-rotor flying platform, a fluid dynamic conveyance system, a specific sensor and a remote transmission system for transmitting the collected data, it is possible to monitor the presence, and possibly also the concentration, of airborne pollutants along vertical transepts and/or spatial trajectories. The process is implemented by coupling single elements, appropriately built and integrated, according to a predefined sequence and by imposing a certain operational procedure. In particular, it must be pointed out that: - the multi-rotor platform has no humans aboard and is controlled remotely, although it includes an on-board automatic flight stabilization system and a system for stopping the flight in the event of failures and/or malfunctions. - the fluid dynamic conveyance system consists of a truncated-cone element arranged in the upper part of the platform and securely anchored thereto; more in detail, the length of this element is such that it allows the monitored air to be taken partly outside the interference field of the rotors, and the flow inlet and outlet areas are so arranged as to allow the air to flow without any hindrance. - the airborne pollutant sensor is located in the upper part of the platform, at the base of the fluid dynamic conveyance system, and its sensitive part is immersed in the outgoing flow. The platform, assembled with the fluid dynamic conveyance system, a specific sensor and a system for remotely transmitting the collected data, is flown along vertical trajectories where stop points are imposed at different altitudes and repositioning shifts are made by means of translational movements. The vertical transepts are obtained by imposing paths that follow lines orthogonal to the ground plane and with one vertex lying therein
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