Some airplanes have cabin air filtration systems equipped with HEPA filters which can remove viruses and germs quickly, minimizing the duration of the exposure to any potential infectious materials produced by a cough or sneeze. The cabin air system is designed to operate most efficiently by delivering approximately 50 percent outside air and 50 percent filtered, recirculated air. The air supply is essentially sterile and particle-free.
However, adequate ventilation is just one of the preventive measures to reduce the risk of COVID-19 transmission. Other important measures include maintaining physical distance of at least 1 meter whenever possible, frequent hand hygiene and wearing a mask. Passengers should check with the airline company and the national or local guidelines about when and where to wear a mask while flying.
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