System for monitoring atmospheric pollution, comprising at least a mobile appliance fitted on a vehicle and at least a remote processing unit, wherein said mobile appliance is fitted onto an electric vehicle and comprises: - at least a location unit suitable for detecting geographic coordinates of said vehicle; - at least an atmospheric sensor suitable for detecting at least an atmospheric pollution value; - at least a transmission unit suitable for transmitting said geographic coordinates and said atmospheric pollution value; and wherein said remote processing unit comprises: - at least a receiving unit suitable for receiving said geographic coordinates and said atmospheric pollution value; - at least a processing unit suitable for processing said geographic coordinates and said atmospheric pollution value for monitoring the atmospheric pollution inside at least one geographic area; characterized by the fact that it comprises: - at least a verification sensor (7, 13); - comparison means between said atmospheric pollution value and at least a reference pollution value (I r) detected by said verification sensor (7, 13), substantially in correspondence to the same geographic coordinates; - signalling means operatively associated with said comparison means and suitable for signalling the need for a calibration of said atmospheric sensor of the mobile appliance, if said atmospheric pollution value substantially differs from said reference pollution value (I r); - at least an automatic calibration unit operatively connectable to said mobile appliance and suitable for automatically calibrating at least an adjusting parameter of said atmospheric sensor of the mobile appliance, so that said atmospheric pollution value detected by the atmospheric sensor substantially corresponds to said reference pollution value (I r) detected by the verification sensor (7, 13); and - at least a recharging column with electric recharging means of said electric vehicle, said automatic calibration unit being associated with said recharging column and being suitable for automatically calibrating said atmospheric sensor when said electric vehicle is connected to said electric recharging means. - at least a location unit suitable for detecting geographic coordinates of said vehicle; - at least an atmospheric sensor suitable for detecting at least an atmospheric pollution value; - at least a transmission unit suitable for transmitting said geographic coordinates and said atmospheric pollution value; - at least a receiving unit suitable for receiving said geographic coordinates and said atmospheric pollution value; - at least a processing unit suitable for processing said geographic coordinates and said atmospheric pollution value for monitoring the atmospheric pollution inside at least one geographic area; - at least a verification sensor (7, 13); - comparison means between said atmospheric pollution value and at least a reference pollution value (I r) detected by said verification sensor (7, 13), substantially in correspondence to the same geographic coordinates; - signalling means operatively associated with said comparison means and suitable for signalling the need for a calibration of said atmospheric sensor of the mobile appliance, if said atmospheric pollution value substantially differs from said reference pollution value (I r); - at least an automatic calibration unit operatively connectable to said mobile appliance and suitable for automatically calibrating at least an adjusting parameter of said atmospheric sensor of the mobile appliance, so that said atmospheric pollution value detected by the atmospheric sensor substantially corresponds to said reference pollution value (I r) detected by the verification sensor (7, 13); and - at least a recharging column with electric recharging means of said electric vehicle, said automatic calibration unit being associated with said recharging column and being suitable for automatically calibrating said atmospheric sensor when said electric vehicle is connected to said electric recharging means.