How safe is the air you breathe in the cabin of the aircraft?
The Environmental Control Systems on all Boeing Aircraft are designed to meet / exceed FAA Requirements and also satisfy all health guidelines set by organizations like OSHA and ACGIH. The cabin ventilation systems provide approximately 50% fresh air and 50% re-circulated air. The re-circulated air passes through High Efficiency Particulate Air (HEPA) filters to remove bacteria and viral particles, prior to returning to the cabin. These HEPA filters are 99.99% efficient and are similar to those used in hospital operating theatres. There are about 20-30 total air changes / hour for the passenger cabin and80 changes / hour for the flight deck, this being more effective and superior to air-conditioned offices (12 times / hour) or Operation Theatres (20 times / hour). The ventilation system provides about 10 CFM of fresh air ventilation and20 CFM total air ventilation / passenger. Levels of bacteria / fungi measured in cabin air are well below the levels accepted as posing health risks, as per US DOT study in 1989 and a recent WHO study found no evidence that air re-circulation facilitated transmission of infectious disease aboard aircraft. The temperature and relative humidity are maintained at recommended levels.
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