The filter cartridge in the gas mask needs to meet the filtration standard of N95, which can effectively prevent the new crown virus, and the cartridge needs to be replaced regularly, and after each use of the gas mask, it should be carefully wiped with medical alcohol before protection. In addition, the gas mask is not suitable for long-term wear, easy to affect the respiratory function, especially the elderly and children, these two groups of people is best to wear masks with protective functions. In addition, the most direct, effective and safe approach is to avoid crowded occasions and avoid contact with any suspected people.