Respiratory masks for use in aircrafts

A method, comprising:

• receiving, from a plurality of sensors, information associated with at least one of cockpit ambient air for at least one parameter capable of affecting oxygen level and health of a crew member for at least one parameter capable of causing respiratory disorder, and providing associated output signals;
• and
• automatically switching between operating modes of a respiratory mask to supply a respiratory gas to the crew member based on the received information, wherein the operating modes comprise a dilution mode, an emergency mode, and a recirculation mode.

The method of claim , wherein the automatically switching between the operating modes to supply the respiratory gas to the crew member based on the received information, comprises:

• automatically switching to the emergency mode when at least one emergency condition occurs, wherein the at least one emergency condition comprises presence of smoke in a cockpit, pressure level inside the cockpit is higher than a predetermined pressure level, partial pressure of oxygen present in blood of the crew member is lower than a predetermined partial re of the oxygen, carbon dioxide level present in exhaled gas is higher than a predetermined carbon dioxide level, breathing rate of the screw member is deviated from a predetermined breathing rate, and tissue oxygen saturation of the crew member is lower than a predetermined tissue oxygen saturation.