The N95 masks are always worn in hospitals but the regular masks are only a means to stop touching your face. If you have no symptoms and don't touch your face, many health officials have said there is no need to wear a mask as the virus is not in the air. It immediately falls to the surrounding objects, even the floor. Washing your hands is the most important thing. In China and some other European countries they are wearing masks all the time when going outside because of the pollution and so they think it is necessary to combat the virus.