Does wearing a disposable mask have an impact? The answer is yes.

We know that there are three layers of disposable masks, the outermost layer is non-woven fabric, which has a waterproof effect; the middle layer is melt blown cloth, which has a filtering effect, can filter dust particles, viruses, etc.; the innermost layer is non-woven fabric, which has moisture absorption Features. If we wear the mask upside down, the outermost layer will lose its waterproof effect, and close contact with people will absorb the spit of others; and our own breath will also condense inside the mask due to the tarp.

How do we distinguish the front and back of the mask? First, explain the distinction between upper and lower. The side with the nose bridge is the upper side and the side without the nose bridge is the bottom. Then the protruding side of the bridge of the nose is the outer layer, which is in contact with the air; the side where the bridge of the nose is not visible is the inner layer, which fits the face. As shown in the picture below, so don't wear the front and back of the mask.