Dust masks are not suitable for people with heart or respiratory difficulties (such as asthma emphysema), pregnant women; People with dizziness, difficulty breathing and sensitive skin after wearing. Dust respirator should not be long to wear: if wearing a mask for a long time, will make the nasal mucosa become fragile, lost the original physiological function of the nasal cavity, so can not wear a mask for a long time. Masks should only be worn in special environments, such as crowded, airtight areas. Of course, in the field walk, in order to resist the wind and cold, or in the environment with air pollution, it is necessary to wear a mask, but the time should not be too long. In addition, during flu season, you should wear a mask in public places where pathogens may be abundant.

About fashion masks: two or three yuan small masks a cute cartoon dolls, is popular with fashionable women, but this kind of fashionable masks - two layer thickness, it is difficult to filter the virus in the air and dust prevention disease, and wear accumulation for a long time to keep the virus germs, etc., use should take off two hours later, timely cleaning and sanitation.

The characteristic of the cotton mask on the market: the advantage is to be able to clean repeatedly use, the disadvantage is the part that the inside contacts the mouth and nose can stay saliva, if not diligent in cleaning, easy to breed bacterium, do not accord with the requirement of hygiene. The fibers of cotton masks are generally very thick and cannot effectively filter small particles, and most of them have not passed the international safety certification, and the protection effect is not guaranteed. Gauze masks have almost no dustproof effect and the air leakage on both sides of the nostrils is too large.

Dust respirator is very easy to accumulate dust, germs and other substances, so when not wearing, should be folded into a clean envelope, and close to the mouth and nose of the fold, do not casually into the pocket or hanging on the neck. If the use is maintenance - free dust mask, do not continue to use after cleaning; If it is a face mask or dust mask that can be cleaned, it should be changed once a day.

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