The American standard (NIOSH Standard) American standard divides the mask into three categories: N only used to protect non-oily particles (such as: N95) R type protects both oily and non-oily particles (such as: R95) for a limited time P type for a long time It is used to protect oily and non-oily particles at the same time (such as: P95) European Standard (EN Standard) European standard stipulates that all masks must have the ability to protect two kinds of particles: FFP1 filtration efficiency is greater than or equal to 80% FFP2 filtration efficiency is greater than or equal to 94% FFP3 filtration The efficiency is greater than or equal to 97%.
Masks should not be worn for a long 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 constitutes 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 nose, 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 copper 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, sand and cold, or activities in an air-polluted environment, you need to wear a copper mask, but the time should not be too long. In addition, during the flu season, you should wear a copper mask when you go to public places where there may be a large number of pathogens. Wearing a mask is just one of the ways to prevent respiratory infectious diseases, and the most important thing is to maintain good living habits.
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