Gas masks can prevent viruses, gas masks nasal masks are much better anti-toxicity, filtration effect is also much stronger than ordinary masks or application masks. But the application of gas masks must need to pay attention to the following points: 1, to be properly disinfected, the need to replace the inner layer of the filter. 2, when wearing gas masks also need to pay attention to the airtightness of the gas mask, if the airtightness is not good, it will affect the effect of antivirus. In the bridge of the nose is prone to air leakage, wear the time to pay attention to the pressure. 3, when the breathing resistance increases, you need to pay attention to the appropriate replacement, according to the breathing resistance to replace the dust filter cotton. 4, in the disinfection of the time to use the regular way to disinfect, such as disinfectant, do not use hot water for cooking.