Most activated carbon masks cannot protect against viruses, and the protection effect of activated carbon masks is not as good as that of KN95 masks, whose structure is non-woven fabric + meltblown fabric + non-woven fabric, and whose structure is non-woven fabric + activated carbon + non-woven fabric. The meltblown cloth in the mask is used to block bacteria. If there is no meltblown cloth in the activated carbon mask, the ability to protect against viruses is relatively poor, mainly because the filtration ability of the activated carbon layer is much worse than the meltblown cloth. Of course, the protection effect of wearing an activated carbon mask is definitely better than not wearing a mask. If you need to go out or contact strangers during home quarantine, it is recommended to choose KN95 masks according to the mask guidelines issued by the National Health Care Commission.