A, “medical surgical mask” mask wearing method (ear hanging): 1, the mask has the color side outward, there is a metal piece of the side up, try not to touch the outside with your hands and then touch the inside, so as not to cause bacterial cross-contamination; 2, tied tightly fixed mask rope, or the mask rubber band around the ear, so that the mask tightly face; 3, the mask should completely cover the mouth, nose and chin; 4, the mask on the Metal piece along both sides of the bridge of the nose pressed tightly, so that the mask close to the face; 5, can not be applied to airborne disease respiratory protection. 2. Wearing method of “N95” mask (headwear): 1. Hold the mask with one hand, with the metal piece side up; 2. ● Airtightness test: Cover the protective mask completely with both hands and exhale quickly. If there is dew air near the nose clip, the nose clip should be adjusted, and if the air leakage is located around, it should be adjusted until there is no air leakage. Source: Beijing Medical News “How to wear a mask to prevent viruses more effectively?