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From the point of view of human physiological structure, because the blood circulation of nasal mucosa is very strong, and the passage in nasal cavity is very tortuous, the nasal hair constitutes a filtering “barrier”. When the air is inhaled into the nostrils, the airflow forms a vortex in the tortuous channel, which heats up the airflow in the nasal cavity. Some tests have shown that when cold air of minus 7 ℃ is inhaled into the lungs through the nasal cavity, the air flow has been heated to 28.8 ℃, which is very close to the temperature of human body.
If you wear a face mask for a long time, it will make the nasal mucosa become fragile and lose the original physiological function of the nasal cavity, so you can’t wear a mask for a long time. Masks can only be worn in special environments, such as in places with many people and poor ventilation. Of course, it is necessary to wear a mask when walking in the wild to resist the wind, sand and cold, or to move in the environment with air pollution, but the time should not be too long. In addition, during the flu season, masks should also be worn in public places where there may be a large number of pathogens. Wearing masks is only one of the ways to prevent respiratory infectious diseases, and the most important thing is to keep good living habits.
