Scientists have found that indoor relative humidity may also influence transmission of the COVID-19 virus, according to a study.

Relative humidity is the amount of moisture in the air compared to the total moisture the air can hold at a given temperature before saturating and forming condensation.

In a study, conducted by researchers from the Massachusetts Institute of Technology (MIT), the research team reported that maintaining an indoor relative humidity between 40 and 60 per cent is associated with relatively lower rates of COVID-19 infections and deaths, while indoor conditions outside this range are associated with worse COVID-19 outcomes.