Over 200 scientists, including myself, signed a letter that was published in the journal Clinical Infectious Diseases on July 6, 2020, saying that COVID is not only spread by touch and droplets sprayed from the mouth and nose but, importantly, via a third route too.
The third infection pathway is in very tiny airborne particles of liquid and material, known as aerosols, that stay suspended in the air for a long time. If the virus attaches to these tiny particles, it can float on the air and spread much further. An effective way to reduce this spread is to purge the air containing those aerosols from rooms by simply opening the windows, as shown below.
Clinical Infectious Diseases
By opening a window to let the virus escape, the amount of virus particles in a room can be reduced, leading to a lower risk of infection.
