The effectiveness of KN95 masks is the same as that of N95, and it is one of the "appropriate substitutes". The filtration efficiency is 95% or above, which can prevent or reduce the dust, pollen and germs in the air from entering the human respiratory organs, such as anti-smog and anti-PM2.5.

The FFP2 mask is equivalent to the US N95 standard in Europe. It can prevent harmful substances in the air, such as lead dust, aerosols, and smoke. Therefore, it is a common mask in the mining and metal industry and agriculture, and it is a must for medical staff to prevent influenza.