The human body is designed to live in environments where relative humidity is within a 40% and 60% range, because of several different factors:
✅ the innate immune defences of the respiratory system function best only when the incoming air is not too dry
✅ many viruses have reduced infectivity at humidity values above 40%
✅ the transmissibility in air of pathogens depends on the ability to remain in suspension of the droplets these are attached to
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