EPA recommends precautions to reduce the potential airborne transmission of the virus, such as ventilation and air filtration as a part of a larger strategy that includes minimizing close contact, surface cleaning, handwashing, and other precautions.
www.epa.gov
“Spread of COVID-19 occurs via airborne particles and droplets. People who are infected with COVID can release particles and droplets of respiratory fluids that contain the SARS CoV-2 virus into the air when they exhale (e.g., quiet breathing, speaking, singing, exercise, coughing, sneezing). The droplets or aerosol particles vary across a wide range of sizes – from visible to microscopic.”