1, respiratory protection articles include masks and face masks, and wash hands before wearing and after taking them off;

2. Pay attention to before and after wearing a mask. The mask should cover the nose and mouth and adjust the nose clip to fit the face;

3. When wearing, avoid touching the inside and outside of the mask with your hands, and take off the mask by stirring the strings at both ends;

4. Wearing multiple masks can not effectively increase the protective effect, but increase the respiratory resistance, which may also damage the sealing performance;

5. There is no evidence to prove the effectiveness of various measures such as mask cleaning and disinfection.

6. Disposable medical masks and surgical masks are limited in use, and the cumulative use shall not exceed 8 hours. Occupational exposure personnel shall not use masks for more than 4 hours and shall not use them repeatedly.