Rumor identification: The breathing valve does not affect the effectiveness of the mask. Rumor analysis: 1. The breathing valve does not affect the protection effect of the mask for ordinary users. A mask with a breathing valve makes the airflow unidirectional to the outside, so the virus will not “enter” through the breathing valve, it does not belong to N95 and medical masks, but it can still play a protective role for the general population to isolate droplets. 2, breathing valve mask for people’s health and design, can be harmful to the human body in the air of visible or invisible substances to filter, so as not to produce adverse effects on the human body. It should be noted that masks with breathing valves can filter the air sucked in, but not the air exhaled. Therefore, for the general population, masks with breathing valves can be worn to protect the wearer. In the case of newly infected patients, suspected infected patients and close contacts during the incubation period, masks with breathing valves should not be worn because the breathing valves do not prevent the spread of droplets from the wearer to the environment and may cause the spread of the virus. Special Note: The mask with breathing valve makes the airflow unidirectional outward, which is not N95 and medical mask, but can play a role in isolating droplets and so on for the general population. Since such masks cannot protect others, it is recommended to try not to wear masks with breathing valves when medical surgical masks or medical protective masks are available.