The main types of masks are classified by function as follows.
1. Ordinary masks: such as cotton masks, activated carbon masks, gauze masks, etc., can be used to prevent freezing, dust, partial anti-haze, but not to prevent the spread of bacteria, viruses.
2. General medical masks: less protective than medical-surgical masks and can be used in non-dense populations.
3. Medical and surgical masks: the protective effect is much better than the general category, before the hospital used more, commonly used in respiratory and surgical use, can be used to prevent the spread of germs and bacteria.
4.N95 mask: N95 mask haze prevention is relatively reliable, haze main component pm2.5 is non-oily particulate matter. It can also be used to protect against the spread of germs and viruses, and is the highest level of protection you can buy today for everyday use.
The KN category applies to filter non-oily particulate matter (such as haze), the latter figure is the percentage of filtration efficiency.KN95 regulations for non-oily particulate matter above 0.075 microns filtration efficiency greater than 95%.N95 is the United States NIOSH dust mask standard, detailed parameters and domestic KN95 consistent. That is to say, KN95 and N95 are just different names, and the level of protection of masks produced according to these two standards is exactly the same. You can buy any of the KN95 or N95 standard masks with no difference in protection.
From the above figure can be concluded on the current "new crown virus" to see their level of protection: KN95/N95 mask ¡Ö medical-surgical mask > general medical mask > general mask.
A good pair of masks should definitely be protective, breathable, fit well, be comfortable to wear, and be friendly to the person wearing the glasses, i.e. not foggy. We should pay attention to these aspects when shopping during the epidemic: features, filter level, price, life cycle, etc.