What kind of mask would you choose in foggy days?

What do KN90 and N95 masks mean respectively? If the filtering ability of the mask to fine particles with a diameter of less than or equal to 2.5 microns reaches 90%, this mask is called KN90 mask, and if the filtering ability reaches 95%, it is KN95 mask. This professional mask can effectively prevent smog and viruses. Accordingly, this kind of mask is airtight, and if the breathing frequency is too fast, it is easy to cause poor breathing. Service life: 40 hours ~ 1 month, not washable. Solemnly remind: KN90/KN95 masks should be worn under the guidance of professional doctors. Children, the elderly and special people with respiratory diseases and cardiovascular diseases should choose carefully.

Gauze mask 2 Gauze mask can only filter large dust particles, which is suitable for cleaning at ordinary times. Service life: disposable. Tips: gauze masks do not have the function of filtering PM2.5, and it is ineffective to use gauze masks to prevent smog.

Surgical mask 3 A surgical mask refers to a mask worn when a patient has respiratory symptoms such as a cold, fever and cough. It can also be used as an anti-influenza mask and used in crowded and poorly ventilated public places. Service life: disposable. Tips: surgical masks do not have the function of preventing PM2.5 particles. Activated carbon mask 4 Activated carbon mask absorbs organic gas and toxic dust, and absorbs toxic gas or acne on the surface. After adsorption saturation, it will start to release toxic gases and acne, which has no bactericidal effect. When you need to breathe hard or can't absorb the smell, you should replace it immediately. Only suitable for painting or spraying pesticides.

Service life: disposable. Tips: surgical masks do not have the function of preventing PM2.5 particles.