An automatic air spray painting apparatus, comprising: at least one painting device equipped with a robotized arm provided with a painting operating head, including: a first outlet for paint; and second outlets for a pressurized flow of a fluid for the formation of a paint cone or fan; a first duct for supplying a flow of paint from a paint source to said first outlet for paint; a second duct for supplying a pressurized flow of carrier fluid that is to atomize said flow of paint; a third duct for supplying a pressurized flow of carrier fluid to said at least said second outlets for forming the paint cone or fan a separation module, supplied by a source of pressurized ambient air for the continuous production of a flow of carrier fluid constituted by high-purity (98%-99.9%) nitrogen directed to said second duct for supplying a pressurized flow of carrier fluid that is to atomize said flow of paint; means (19, 24, 25) for regulating the pressure of the flow of nitrogen for atomization; and adjustable heat conditioning means (18, 9, 26) for heat conditioning of the flow of nitrogen for atom ization wherein said means (19, 24, 25) for regulating the pressure are provided for keeping the flow of nitrogen at a pressure comprised between 0.5 and 4 bar, preferably between 0.5 and 1.5 bar; and wherein said heat-conditioning means (18, 9, 26) are provided for keeping the flow of nitrogen at a temperature adjustable between 8°C and 80°C, preferably between 8°C and 22°C, said apparatus being characterized in that said third duct for supplying a pressurized flow of carrier fluid to said second outlets for forming the paint cone or fan is not coinciding with said second duct for supplying a pressurized flow of carrier fluid that is to atomize said flow of paint, said separation module, being arranged to supply said flow of carrier fluid to said second outlets. a first outlet for paint; and second outlets for a pressurized flow of a fluid for the formation of a paint cone or fan; a first duct for supplying a flow of paint from a paint source to said first outlet for paint; a second duct for supplying a pressurized flow of carrier fluid that is to atomize said flow of paint; a third duct for supplying a pressurized flow of carrier fluid to said at least said second outlets for forming the paint cone or fan a separation module, supplied by a source of pressurized ambient air for the continuous production of a flow of carrier fluid constituted by high-purity (98%-99.9%) nitrogen directed to said second duct for supplying a pressurized flow of carrier fluid that is to atomize said flow of paint; means (19, 24, 25) for regulating the pressure of the flow of nitrogen for atomization; and adjustable heat conditioning means (18, 9, 26) for heat conditioning of the flow of nitrogen for atom ization wherein said means (19, 24, 25) for regulating the pressure are provided for keeping the flow of nitrogen at a pressure comprised between 0.5 and 4 bar, preferably between 0.5 and 1.5 bar; and wherein said heat-conditioning means (18, 9, 26) are provided for keeping the flow of nitrogen at a temperature adjustable between 8°C and 80°C, preferably between 8°C and 22°C, said apparatus being characterized in that said third duct for supplying a pressurized flow of carrier fluid to said second outlets for forming the paint cone or fan is not coinciding with said second duct for supplying a pressurized flow of carrier fluid that is to atomize said flow of paint, said separation module, being arranged to supply said flow of carrier fluid to said second outlets. a separation module, supplied by a source of pressurized ambient air for the continuous production of a flow of carrier fluid constituted by high-purity (98%-99.9%) nitrogen directed to said second duct for supplying a pressurized flow of carrier fluid that is to atomize said flow of paint; means (19, 24, 25) for regulating the pressure of the flow of nitrogen for atomization; and adjustable heat conditioning means (18, 9, 26) for heat conditioning of the flow of nitrogen for atom ization wherein said means (19, 24, 25) for regulating the pressure are provided for keeping the flow of nitrogen at a pressure comprised between 0.5 and 4 bar, preferably between 0.5 and 1.5 bar; and wherein said heat-conditioning means (18, 9, 26) are provided for keeping the flow of nitrogen at a temperature adjustable between 8°C and 80°C, preferably between 8°C and 22°C, said apparatus being characterized in that said third duct for supplying a pressurized flow of carrier fluid to said second outlets for forming the paint cone or fan is not coinciding with said second duct for supplying a pressurized flow of carrier fluid that is to atomize said flow of paint, said separation module, being arranged to supply said flow of carrier fluid to said second outlets.