The mask is a hygiene product, belongs to the home daily class, usually refers to wear in the mouth and nose parts used to filter the air into the mouth and nose, in order to achieve the blocking of harmful gases, odors, droplets in and out of the wearer's mouth and nose of the appliances, made of gauze or paper, etc..
The mask to enter the lungs of the air has a certain filtering effect, in the respiratory infectious disease epidemic, in the dust and other contaminated environments when working, wearing a mask has a very good role, masks can be divided into air filtration masks and air supply masks, and masks of the dust-blocking efficiency of the high and low is to its fine dust, especially for the respiratory dust below 2.5 microns of the efficiency of the blocking for the standard. Because this particle size of the dust can directly into the alveoli, the greatest impact on human health.