How is the medical mask dustproof

How is the medical mask dustproof
Generally speaking, in order to protect the body effectively, there are certain requirements for the specifications of the mask. It must cover the human nose and mouth to enable people to breathe freely. Generally speaking, the size of the adult medical mask is 18 * 9, while the size of the child medical mask is 15 * 9.
The medical mask is made of non-woven fabric. This material does not need to be woven, but is bonded by some fibers. It is often made into a 2-layer mask, a 3-layer mask and a multi-layer active carbon mask.
The medical mask can effectively prevent the fine dust in the air, especially for the respiratory dust below 2.5 microns, because the dust of this particle size can directly enter the pulmonary alveoli, which has a great impact on human health. The operating principle of medical masks is that when the dust passes through the gauze, it will pass through layers of barriers, and these dust will be adsorbed on the gauze, so that fresh air can enter the respiratory system.