1. Cottonmask. Cotton masks once occupied the main market. The main function of cotton mask 4102 is to keep warm and prevent cold air 1653 from directly irritating the respiratory tract. Cotton masks have good air permeability, but cotton masks have almost no dust-proof and anti-bacterial effects. If they are in high epidemic periods and haze weather, cotton masks have little effect.
2. Medical non-woven masks. Medical non-woven masks can be said to have quickly entered ordinary households from SARS. Non-woven masks can effectively prevent bacteria, and are limited to preventing bacterial infections caused by spraying. For example, it can prevent the spread of germs caused by sneezing.
However, due to its poor fit, it cannot play the role of dust prevention. The editor sees that many friends wear such masks in haze days, but they are actually effective.
3. Activated carbon mask. This type of mask refers to the addition of activated carbon in the interlayer of the mask. The activated carbon has a strong adsorption capacity and can effectively prevent bacteria and dust. However, this type of mask will make breathing difficult and will be prone to hypoxia after long-term use.
4. Dust masks. Dust masks are generally cup-shaped, which can effectively fit on the mouth and nose to achieve the effect of dust prevention.
5. N95 and above masks. n95 is a kind of dust respirator, N means dustproof, and the number means efficiency. Today, when smog is popular, if you want to prevent PM2.