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Cotton masksThese only provide protection against heat or cold.The surface of the mask has large pores and cannot filter fine particles with a particle that may be as small as 2.5 microns. Some cotton
Read MoreIn winter, there may be lifestyle habits that are harmful to your health. For example, during the winter season, some people often wear a mask when they go out, thinking that they can protect against
Read MoreN90 and N95 are the protection levels in the national mask standard. The different standards represents different protection- and filtering capabilities of a mask, i e its ability to block dust, bacte
Read MoreUsually, the disposable masks we buy in pharmacies are medical surgical masks. They have front and back sides, with the darker usually blue side facing out, and the lighter side facing inwards towards
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