But what are the different types of anti-pollution masks and which one is best suited ... the main entry points for bacteria, viruses, pollutants and particulate matter to enter the body.

With regard to non-woven masks, the type that passed the filtering performance ... meaning they served no useful preventive measure against the virus. “This experiment reconfirmed that wearing ...

Kazuhiko Hanzawa, a specially appointed professor of vascular surgery at Niigata University, said the surgical mask can inhibit virus activity ... hydroxyl radical, a type of active oxygen.

Following is a transcript of the video. Dr. Stephen Morse: "Wearing a mask will protect me from the virus." The problem is that people who wear these masks usually don't wear them properly.