Is wearing a mask to prevent germs or fine particles in foggy days?

Wearing a mask in foggy days is mainly to prevent particles.

The protective effect of mask depends on the air leakage rate of mask and the protective level of cotton filter.

For the sake of health, it is recommended to choose a dust mask in the following ways:

1, masks must be certified by LA.

2. According to the national standards, masks are divided into disposable, compound semi-masks and full-mask masks. It is only recommended to choose a disposable mask that prevents smog. In the environment of high concentration smog and dust, it is recommended to choose a compound semi-mask.

3. According to the national standard, the masks are divided into three grades: KN 100, KN95 and KN90, and the protective rate of KN 100 to ultrafine dust is over 99.97%.

Because the cotton filter of the mask now uses the electrostatic adsorption principle, some masks also use double-sided and double-sheets at the same time, and the breathing is also very smooth. Generally, the cost of using a dust mask is about1-a day in 2 yuan, which is affordable even if the income is not high.

According to national standards, masks should be divided into three sizes: large, medium and small. Need to choose.

5. It is recommended to choose silicone material for better comfort. Facial indentation is light.

Through the above method, respiratory system injury can occur effectively.