Airlines reduce the passengers' fresh air to save money. Pilots reduce the fresh air in the passenger cabins, but not for themselves in the cockpit. The amount of oxygen-rich, fresh air the pilots get is believed adequate to keep them clear-headed for the safety of the airplane.
A case can be made that the low-oxygen, recirculated air that passengers breathe can make them woozy, grumpy and vulnerable to catching contagious diseases.
According to the book, The Airliner Cabin Environment (National Academy Press, page 43), when the pilots cut back on air, these pilots get ten times more fresh air than economy passengers get. This happens every day on many airlines.
A study of office buildings found that the transmission of contagious diseases increases significantly when a large percentage of air is recirculated. It seems logical to apply this finding to the airline cabin environment.
Though using all the fresh air available on board isn't going to eliminate the transmission of contagious diseases in aircraft cabins, it will very likely reduce the transmission of contagious diseases on board.
Passengers seated closest to the contagious individual are most at risk. There are other considerations such as where the contagious passenger is seated, the aircraft’s air vents, the flight time and the number of passengers aboard.
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