Mosses can help to stabilize moisture levels in a room and maintain levels of relative humidity at between 40 and 60 per cent.
This is one of the more interesting and beneficial attributes of moss – that it can absorb moisture out of the air when humidity is high and then release it back to the air when humidity is low.
How is this beneficial to humans? Studies have shown that viruses like influenza are most likely to spread when humidity drops below 10 grams/cubic meter. Therefore, during low-humidity times of the year, moss walls can help your indoor spaces to maintain humidity levels that don’t promote the spread of disease. But moss takes disease prevention one step further as well. It also serves to clean the disease particles that are already floating around in the air.