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As daily protection, there is no need to blindly pursue high-level protection capabilities, just moderate. The choice of masks is not the more expensive the better, nor the cheaper the better, but a reasonable choice according to your own actual situation. Buying kn95 disposable face mask to avoid "entering the pit" can be divided into three steps
The first step is to choose regular purchase channels such as chain supermarkets, pharmacies, and online flagship stores. When purchasing, carefully check the factory name, factory address, contact number, production date, and expiration date on the packaging. "General mask products will be marked with product information on their smallest sales units. If the information is missing, we must be vigilant."
The second step is to identify the implementation standards. "There are many standards for masks, and you don't need to be familiar with them all. Just remember that GB is a national standard and YY is a medical and health standard. The standard that starts with these two codes is usually correct.
The third step, after getting the mask, check whether the product packaging is in good condition, and whether the product surface is damaged or deformed. If the product has a tightness inspection method, you can check it yourself according to the method. "It should also be reminded that hair will affect the fit of the mask to the face. For better protection, it is not recommended to grow beards when wearing high-level protective masks such as KN95."
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The Wall