What is the role of wearing a kn95 level mask?

What is the role of wearing a kn95 level mask?
The wearing efficiency of the kn95 class mask on the particles with aerodynamic diameter ≥0.3µm can reach more than 95%. The aerodynamic diameter of airborne bacteria and fungal spores varies mainly between 0.7-10µm, which is also within its protection range.

Therefore, this type of mask can be used for respiratory protection of certain particulate matter, such as dust generated by grinding, cleaning and processing of minerals, flour and certain other materials. It is also suitable for liquid or non-oily non-production caused by spraying Particulate matter of harmful volatile gas.

Can effectively filter and purify the inhaled abnormal odors (except toxic gases), help reduce the exposure level of certain inhalable microbial particulates (such as mold, anthrax, tuberculosis, etc.), but it cannot eliminate contact infection, illness or death risks of.

The KN95 level is one of the levels specified in the Chinese standard GB2626-2006, and the N95 is one of the levels specified in the American standard 42 CFR 84. The technical requirements, test methods, and protection levels of these two levels are basically the same, but they belong to the standards of different countries.