According to the survey, many people are very resistant to KN95 masks, saying that KN95 masks have poor air permeability and will cause people to be poisoned if they are worn for a long time. Is this statement true? In fact, many users fail to follow the formal operation. To use it leads to such consequences.
And in the winter in the north, there are almost no windows open indoors. The number of people in the room naturally produces a lot of carbon dioxide. Wearing KN95 masks is even more serious. Therefore, what kind of mask to choose, what kind of environment to use, and how to use it correctly are issues that must be considered before buying a mask.