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The following are extracted from the network, for reference only

one
Generally, medical masks are enough for going out
If you have an N95 mask at home, it should be used when you need it, such as when you go to the hospital. You can drive alone without wearing masks.
"Neocoronal pneumonia" is spread through close contact and droplets. Feng Zijian, deputy director of the China Center for Disease Control and Prevention, said that wearing masks and personal prevention should first be considered based on the risk of personal exposure to disease. If you go to public places or take public transportation, it is recommended to wear a mask. If you are alone, driving or taking a walk in the park, you can also not wear a mask without the contact of dense people. In this case, the risk of infection is very low.
Of course, medical personnel who directly care for and serve patients with pneumonia infected by new coronavirus have the highest risk. They should wear masks and other personal protective equipment that meet the requirements of infection prevention and control in strict accordance with hospital regulations.
two
You don't need to change it once
Ordinary people can decide whether to replace masks according to their cleanliness. In case of tight supply, the number of masks used can be safely and reasonably extended.
In an interview with the Science and Technology Daily, Professor Jin Xiangyu, Department of Nonwoven Materials and Engineering, Donghua University, clearly replied that no matter what the popular "steaming" or "boiling", the charge in the filter layer will disappear rapidly when water enters, resulting in a sharp decline in the filtering effect. It is difficult to disinfect the inside of medical masks by smearing and spraying alcohol on the surface. In the current epidemic situation, the disinfection and reuse of disposable anti-virus masks should not be advocated.