Air Quality in Commercial Airplanes
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As environmental awareness is gaining popularity among many people, awareness about the quality of air is usually related to climate. Examples of this are emissions tied into climate change. Although the climate of the earth and all living organisms depending on air is greatly affected by emissions, humans are directly affected by air quality as well.
Most of the media coverage about air quality awareness comes in the form of a symbol requiring proper ventilation for use of some airborne chemicals. Residential and work related air quality awareness is related to closed windowed structures depending on HVAC systems.
In commercial airplanes, the altitude of flight travel required a sealed pressurized cabin. As seen in this video, there are flights in which harmful chemicals are released into the airplane cabin. The FAA in the U.S. is well aware of this and has some information on proposed implementations of cabin air quality recommendations here.