Mt Whitney Zone Forums The Chat Room O2 Saturation & AMS, Long, Bear with Me

The DreamLiner (787) also allows for increased humidity. (Humidity is controlled to a low value in tin jets, due to corrosion.)

The other huge improvement is using electric compressors rather than bleed air from the engines. That air is in contact with some rather exotic lubrication chemicals. Probably a good research paper on travel sickness there...

"The internal cabin pressure of the 787 is increased to the equivalent of 6,000 feet (1,800 m) altitude instead of the 8,000 feet (2,400 m) on older conventional aircraft. According to Boeing, in a joint study with Oklahoma State University, this will significantly improve passenger comfort. Cabin air pressurization is provided by electrically driven compressors, rather than traditional engine-bleed air, thereby eliminating the need to cool heated air before it enters the cabin. The cabin's humidity is programmable based on the number of passengers carried, and allows 15% humidity settings instead of the 4% found in previous aircraft. The composite fuselage avoids the metal fatigue associated with higher cabin pressure, and eliminates the risk of corrosion from higher humidity levels. The cabin air-conditioning system improves air quality by removing ozone from outside air, and besides standard HEPA filters which remove airborne particles, uses a gaseous filtration system to remove odors, irritants, and gaseous contaminants as well as particulates like viruses, bacteria and allergens."