The North was once again hit by “smog”. No one knows PM2.5 any more, and there is no need to talk about its harm. Generally speaking, the only way for ordinary people to prevent smog is to wear masks.
There are many masks on the market, among which the most common are cotton masks, medical surgical masks, activated carbon adsorption masks, N95 masks and so on. But! Only N95 mask can really block particles below 2.5 microns. Now, Xiao Jiu will introduce this “anti smog weapon” to you in an all-round way.
advantages and disadvantages of N95 mask
advantages: effectively block particles (PM2.5) with a diameter of less than 2.5 microns that can enter the lung. In the production standard of N95, the test samples are particles with a diameter of 0.1-0.5 microns, and the filtering rate of qualified N95 masks should exceed 95%.
disadvantages: wear training and tightness test are required before use, and because of the large respiratory resistance, it may not be comfortable to wear.
how to wear N95 mask
1. Select the normal / small size model according to the face type, and run the headband every 2-4cm, with the metal soft strip upward.
2. Put on the mask and keep it close to the face. The upper headband of the mask is placed behind the head, and then the lower headband is pulled over the head, placed behind the neck, and adjusted to a comfortable position.
3. Press the index finger and middle finger of both hands along the metal strip of the bridge of the nose from the top of the center to both sides slowly inward until they are close to the bridge of the nose.
4. Cover the mask with both hands and conduct positive and negative pressure test.
Positive pressure test: cover the mask with both hands and breathe vigorously. If the air overflows from the edge of the mask, that is, it is improper to wear it. It is necessary to adjust the headband and the metal bar of the nose bridge again.
Negative pressure test: cover the mask with both hands and breathe vigorously. The center of the mask will sink. If air enters from the edge of the mask, it is improper to wear it. It is necessary to adjust the headband and the metal bar of the nose bridge again.
When wearing a mask, pay attention to:
Wash your hands thoroughly before wearing or after removing the mask to ensure hygiene. In the process of wearing and taking off the mask, it is necessary to pay attention not to touch the mouth and nose with unwashed hands.
N95 masks do not need to be discarded at one time. Generally speaking, they should be replaced after two days of use, otherwise they will not play a protective role. Used masks should be carefully discarded. In order to prevent hands from touching the surface of the water splashing layer of masks, they should be wrapped with a tie rope or elastic band or paper and then thrown into the garbage can.
In addition, when purchasing masks, it should be noted that qualified and regular masks should have the product standard number, the license of the medical device manufacturer, and the medical device registration certificate. In general, the validity period of masks is 2-5 years. If it expires, it may become damp and absorb damp dust. In addition, some airtightness of the product will cause some problems.
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