KN95 mask can help reduce exposure to biological substances, like bacteria and viruses. Please note however that wearing a mask cannot eliminate the danger of infection because it depends on the right fit of the wearer. A study published in 2008 showed that masks were up to 80% effective in reducing transmission and infection from airborne virus.Different countries have different regulations and standards for facepiece respirators, and they are applicable to their respective national physical characteristics, national acceptance, etc.
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