The function of face mask

Face mask is a kind of hygiene products, generally refers to the equipment worn in the mouth and nose to filter the air into the mouth and nose, so as to prevent harmful gases, smells, droplets in and out of the wearer's mouth and nose.

 

Masks have a certain filtering effect on the air entering the lungs. Wearing masks has a filtering effect when respiratory infectious diseases are prevalent and when working in a polluted environment such as dust.

Source: https://www.unisourcesgroup.com/news/18.html