There is evidence that Increasing indoor humidity reduces the spread of influenza virus and probably SARS-CoV-2. The mechanisms discussed in the literature include promoting the action of the cilia of epithelial cells in clearing pathogens, reduction of the stability of lipid-enveloped viruses in aerosols and on surfaces, and slowing the evaporation of cough droplets, causing them fall faster and spread less. Indoor relative humidity typically decreases in winter as cooler air from outside containing less water is heated. This may cause the seasonality of flu. Are humidifiers underutilized tools to help prevent a resurgence of COVID-19 this fall and winter before medical interventions are available?
So I found the answer to my question after some, well, research. See Presentation How to Potentially Avoid the Catastrophe of COVID-19 Seasonality