Emergency oxygen supply mask adapted for rescuing a passenger of an aircraft in an emergency situation, comprising: - an oxygen mask having a mask body with a first opening for covering a mouth and/or a nose of the passenger and with a second opening connecting said first opening for providing breathable supply air, - a physical reaction component connected to the mask body for receiving air, said air comprising exhaled air out of said mask body, adapted for converting said air into supply air by a physical reaction between said air and a physical reaction material in said physical reaction component to produce oxygen-enriched air, and for supplying said oxygen-enriched air as the supply air to the first opening of the mask body, wherein - the physical reaction component comprises a number of flow beds enclosing said physical reaction material to receive a flow of air and provide a flow of oxygen-enriched air when receiving the air, and - a flow bed is a sieve-bed having an inlet first side and an outlet second side for passing through exhaled air and an outlet first side and an inlet second side for passing through inhaled air, wherein, - the physical reaction component comprises a first sieve-bed and a second sieve-bed, wherein - in a first breathing cycle for exhaling the first sieve-bed is functioning as an adsorption bed and for inhaling the second sieve-bed is functioning as a desorption bed, and - in a second breathing cycle for exhaling the second sieve-bed is functioning as an adsorption bed and for inhaling the first sieve-bed is functioning as a desorption bed, and in the physical reaction component a first flow bed and a second flow bed of at least two flow beds are provided and a flow path from at least two flow paths to the flow beds is provided, wherein, - an actuable switching valve means is adapted to charge said flow path selected from the at least two flow paths with a exhaled air in one breathing cycle and to charge another flow path selected from the at least two flow paths with inhaled air in another breathing cycle, and - the physical reaction component is releasably connected to a pressurized reservoir or manifold of air. - an oxygen mask having a mask body with a first opening for covering a mouth and/or a nose of the passenger and with a second opening connecting said first opening for providing breathable supply air, - a physical reaction component connected to the mask body for receiving air, said air comprising exhaled air out of said mask body, adapted for converting said air into supply air by a physical reaction between said air and a physical reaction material in said physical reaction component to produce oxygen-enriched air, and - the physical reaction component comprises a number of flow beds enclosing said physical reaction material to receive a flow of air and provide a flow of oxygen-enriched air when receiving the air, and - a flow bed is a sieve-bed having an inlet first side and an outlet second side for passing through exhaled air and an outlet first side and an inlet second side for passing through inhaled air, wherein, - the physical reaction component comprises a first sieve-bed and a second sieve-bed, wherein - in a first breathing cycle for exhaling the first sieve-bed is functioning as an adsorption bed and for inhaling the second sieve-bed is functioning as a desorption bed, and - in a second breathing cycle for exhaling the second sieve-bed is functioning as an adsorption bed and for inhaling the first sieve-bed is functioning as a desorption bed, and in the physical reaction component a first flow bed and a second flow bed of at least two flow beds are provided and a flow path from at least two flow paths to the flow beds is provided, wherein, - an actuable switching valve means is adapted to charge said flow path selected from the at least two flow paths with a exhaled air in one breathing cycle and to charge another flow path selected from the at least two flow paths with inhaled air in another breathing cycle, and - the physical reaction component is releasably connected to a pressurized reservoir or manifold of air.