N95 mask: Under the test conditions specified by NIOSH standards, the filtration efficiency of the mask filter material for non-oily particles (such as dust, acid mist, paint mist, microorganisms, etc.) reaches 95%. It has a good protective effect and can effectively filter a variety of harmful substances in the air. The sealing effect is also relatively good, but wearing it for a long time will cause stuffiness and discomfort, and it is easy to cause respiratory diseases. It is often used in medical, highly polluted environments and other scenarios with high protection requirements.