Few countries make mandatory use of Coronavirus Protective Face Mask Many countries has been made the use of face mask against coronavirus to ease the effect of pandemic for their citizens. It has been also asked to wear the coronavirus protective face mask in mass gathering by the government officials. In addition, many countries are

1. What’s an KN95 mask? An KN95 respirator is a respiratory protective face mask, designed to help reduce the user’s exposure to airborne particles including very small particles (0.3 microns) and large droplets. KN95 respirator face mask literally has a filtration efficiency of at least 95% against non-oily particles.     2. Differences between KN95