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There are many scientific studies that show the direct and indirect effects of low relative humidity on human health and how it can influence airborne infection.
Here is just a selection of the overwhelming evidence for maintaining an optimum indoor humidity of 40-60%RH for human health and wellbeing.
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High humidity leads to loss of infectious influenza virus from simulated coughs
Criteria for human exposure to humidity in occupied buildings
Indirect health effects of relative humidity in indoor environments
Influenza and humidity - Why a bit more damp may be good for you!
Influenza virus transmission Is dependent on relative humidity and temperature
Dynamics of airborne influenza A viruses indoors and dependence on humidity
Relationship between humidity & influenza A viability in droplets & implications for flu's seasonality
The influence of relative humidity on the infectivity of air-borne influenza A virus (PR8 strain)
Modeling the airborne survival of influenza virus in a residential setting
Absolute humidity and the seasonal onset of influenza in the continental United States
The lethal effects of relative humidity on bacteria
Low ambient humidity impairs barrier function and innate resistance against influenza infection
The effect of low humidity on the human tear film
On the mucus flow rate in the human nose
Nasal mucociliary transport in healthy subjects is slower when breathing dry air
The dichotomy of relative humidity on indoor air quality
Physiological and subjective responses to low relative humidity
Humidification to reduce respiratory illnesses in nursery school children
Humidification and upper respiratory infection incidence (army barracks study)
The effect of indoor relative humidity on absenteeism & colds in schools
Winter humidities and related absenteeism in Canadian hospitals
Is low indoor humidity a driver for healthcare-associated infections?
Socio-medical study on pathogenesis and prophylaxis of common colds (kindergarten study)
A comparison of relative humidity between two Swedish buildings with different ventilation solutions
Predictors of indoor absolute humidity and estimated effects on influenza virus survival in grade schools