Here is an overview of the likelihood of infection in three everyday scenarios, based on the safety measures used and the length of exposure.

See What Happens when Six People Get Together and One is Infected

The risk of infection is highest in indoor spaces but can be reduced by APPLYING ALL AVAILABLE MEASURES TO COMBAT INFECTION via aerosols.

The coronavirus is spread through the air, especially in indoor spaces. Tiny contagious particles exhaled by an infected person that remain suspended in the air of an indoor environment. How does the transmission work? And, more importantly, HOW CAN WE STOP IT?

We need “layers of protection.” NO MAGIC BULLET.

✅ Think about trying to not breathe smoke.

✅ Some people still think that if they wear a mask and keep 6 ft apart, they are totally safe – THIS IS FALSE!

✅ Outdoors, distanced, and with masks is almost completely safe. ONLY ALMOST SILVER BULLET.

✅ Indoors is never completely safe. NO SILVER BULLET.

✅ Avoid or reduce Crowding, Indoors, low Ventilation, Close proximity long Duration, Unmasked, Talking/singing/shouting.

✅Every public space should display CO2 meters. These are Real-time indication of ventilation everywhere.

There is overwhelming evidence that breathing in the coronavirus from the air is a major route of transmission of Covid-19. Thus, we need to avoid sharing each other’s air as much as possible. The easiest way to do this is to move activities outdoors, where the likelihood of transmission is much lower.

ℹLinsey Mar

Dr. Marr is a professor of civil and environmental engineering at Virginia Tech who studies how viruses and bacteria spread through the air and is one of the 239 scientists who signed an open letter in early July 2020, pressing W.H.O. to consider the risk of airborne transmission more seriously.

ℹ José Luis Jiménez is an atmospheric chemist at the University of Colorado and an expert in the chemistry and dynamics of air particles. 

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