2. Pay attention to distinguish the front and back of the mask, with blue facing outwards and white facing inwards. After wearing it, let the mask fit the face, and judge whether they fit by breathing;
3. Wear a mask every 4-6 hours and don't wear it for too long;
4. When taking off the mask, pay attention to take off the ear hook by hand, and don't let the polluted area pollute other places again;
5. Take off the mask and discard it in time;
6. After taking off the mask, pay attention to washing your hands and keep them clean.