Japanese chemistry professor shows why three kinds of masks could be effective against the virus soranews24.com

A helpful science experiment shows that masks, whether bought in a store or made at home, can help protect you against coronavirus.
Essentially, he tested whether masks of each of the three varieties were effective at blocking particles in the air, and the results were pretty interesting.
In short, the resulting graph bars show the concentration of each particle diameter per cubic centimeter.
The air that the SMPS measured now had significantly lower amounts of particles than before; somewhere around 1,800 per cubic centimeter.
Science seems to indicate that masks are reasonably effective at catching particles that are the same estimated size is the COVID-19 virus.