Abstract: The invention relates to a nozzle 1 for the directed delivery of CO2 snow and compressed air, wherein a central region 5 of the nozzle 1 has at least a first discharge opening 6 which is designed to produce a core jet 2 of CO2 snow at ultrasonic speed, wherein the central region 5 of the nozzle 1 is surrounded by a peripheral region 7 which has several second discharge openings 8 which are arranged around the first discharge opening 6 and are designed to produce a mantle jet 3, surrounding the core jet 2, of air, preferably compressed air at a lower speed than the core stream 2, wherein the mantle jet 3 travels in the same direction as the core jet 2, and a method for the treatment, in particular cleaning, with CO2 snow of a workpiece to be coated, wherein a core jet 2 of CO2 snow is directed at a speed of more than 200 m/s with a mantle jet 3, surrounding the core jet 3, of air or compressed air, onto the workpiece, wherein the mantle jet 3 travels at a lower speed than the core jet 2.