PM2.5 masks can prevent the invasion of new coronaviruses, mainly refers to the masks that can effectively filter PM2.5 particles, 0.25 micron level masks, can effectively filter airborne viruses, bacteria and other tiny particles. The outer layer of the mask is antibacterial fabric, the middle layer is warm filler, and the innermost layer is PM2.5 filter, with activated carbon added in the middle. PM2.5 masks can prevent the invasion of new coronaviruses, but PM2.5 masks are disposable masks, mainly used in environments with serious dust, with poor breathability, which may cause dizziness due to lack of oxygen, and the water vapor carried by breathing tends to float on the inner wall of the mask, which has a Respiratory system is slightly affected, it is recommended to use N95 mask to prevent new coronavirus.