Originally Posted by
Mesabah
The air you are breathing on an airplane is recycled from directly outside of your window. That means you are breathing everything that the airplanes gives off and is flying through. The air that is pumped in isn’t pure oxygen either, it’s mixed with nitrogen, sometimes almost at 50%. To pump a greater amount of oxygen in costs money in terms of fuel and the airlines know this! The nitrogen may affect the times and dosages of medications, make you feel bloated and cause your ankles and joints swell
This is a very special kind of stupid...
Don't forget to mention where the nitrogen comes from - the airline puts nitrogen in the tires under pressure and it is the pressure in the tires that pushes the nitrogen into air-bags and mixed together using the mechanical energy of the flushing moment from each toilet. :-)
As an aside, the pressure bled off from the tires is calculated precisely so as to have the required pressure in the tires for landing