Respiratory viruses are transmitted from person to person mainly through droplets containing the virus when an infected person speaks, coughs or sneezes. One of the ways to prevent respiratory diseases is to wear or cover up a mask.

Air pollution is becoming increasingly serious, directly affecting human health. Among them, the most serious impact on the body is fine dust, a type of super small dust that regular masks cannot filter. So what kind of mask can protect against fine dust and what are their effects?