Wherever you are sharing air, the lower the CO2 level in a room, the lower risk of infection from respiratory viruses.
There is no single CO2 level at which a person can assume a shared indoor space is safe so wear mask in crowded indoor spaces this winter season
#sickbuildings #sickschools, #IAQ, #covid #RSV #CovidisAirborne #COVIDisAirborne #IndoorAirQuality
