Use time

From the perspective of human physiological structure, because the blood circulation of the nasal mucosa is very strong, the passage in the nasal cavity is very tortuous, and the nasal hair forms a filtering "barrier". When air is sucked into the nostril, the airflow forms a vortex in the tortuous passage, which warms the airflow sucked into the nasal cavity. Some tests have shown that when cold air at minus 7°C is sucked into the lungs through the nasal cavity, the airflow has been heated to 28.8°C, which is very close to the temperature of the human body. If you wear a mask for a long time, the nasal mucosa will become fragile and lose the original physiological function of the nasal cavity, so you cannot wear a mask for a long time. Masks can only be worn in special environments, such as places with a lot of people and poor air circulation. Of course, walking in the wild, in order to resist wind and sand and cold, or activities in an environment with air pollution, you need to wear a mask, but the time should not be too long. In addition, during the flu season, you should wear a mask when you go to public places where there may be a large number of pathogens. Wearing a mask is only one of the ways to prevent respiratory infections. It is important to maintain good living habits.

Cleaning and maintenance

The outer layer of the mask often accumulates a lot of dust, bacteria and other dirt in the outside air, while the inner layer blocks the exhaled bacteria and saliva. Therefore, the two sides cannot be used alternately, otherwise the dirt on the outer layer will be directly attached to it. It becomes a source of infection when it is inhaled into the human body when it is in the face. When you are not wearing the mask, you should fold it and put it in a clean envelope, and fold the side close to your nose and mouth. Don't just stuff it in your pocket or hang it around your neck.

If the mask is wetted by exhaled heat or saliva, its function of blocking germs will be greatly reduced. Therefore, usually prepare a few more masks for replacement, and they should be changed and washed once a day. When washing, it should be scalded with boiling water for 5 minutes.