Yesterday I flew on Airbus A320 and on the airline's board catalogue, there were written some "curiosities". On was written that the air coming from the air conditioning inside the fuselage is very dry, (3-10% humidity) because while it's warmed up from the freezing outside air, it is much more complicated to humidify it.
Firstly I never even thought that our breathable air comes from the outside.
- During flight, from where air intake is made in an aircraft?
- Does this air also contain CO2 along with Oxygen dumped directly to the fuselage?