1,Mask replacement:
The correct wearing of masks is a prerequisite to play the role of masks in preventing the spread of respiratory diseases.
1, masks dedicated to a person, can not be cross-use, there is a mistake, wrong masks should be replaced in a timely manner.
2, disposable medical masks and medical surgical masks, it is recommended that the cumulative use time of a single mask does not exceed 8 hours. Occupationally exposed personnel masks can be used for no more than 4 hours, but cannot be reused.KN95, N95 protective masks, disposable medical masks or medical surgical masks, there is no special difference in the frequency of replacement.
3、When going to the hospital for consultation, accompanying, accompanying, close contact with a breathing
4、Masks should be replaced immediately after being contaminated by respiratory or nasal secretions and other bodily fluids.
5, the mask appeared dirty, deformation, damage, odor should be replaced in a timely manner.
In addition, the mask use beyond the period, or does not meet the current national or industry standards, to be replaced in a timely manner.

02,Mask selection:
Cotton masks cannot effectively block the role of respiratory droplets and aerosol-borne pathogens. It is recommended that the public choose masks scientifically according to the mask guidelines in conjunction with their own health realities, the magnitude of the risk of infections in the environment they are in, and the guiding recommendations of medical personnel.
In order to keep warm or prevent infection and wear multiple masks is also not desirable, wearing multiple masks not only can not play a role in increasing the protective effect, but will increase the breathing resistance, but also may destroy the mask's tightness.