Cold currents, flu, pollen, air pollution...have people wearing masks. However, many people wear a mask for three or four days, or even black, and do not change their clothes. Deputy Chief Physician, Department of Respiratory Medicine, Zhongda Hospital, Southeast University Han Shuhua told reporters that when wearing masks for a long time, the gas exhaled in the mouth would attach to the inside of the mask. If they are not cleaned or replaced in time, they can easily grow bacteria and harm health. Contaminants accumulate on the mask and affect the respiratory system.
Han Shuhua said that under normal circumstances, masks should be changed or cleaned daily. When the weather is more serious, the frequency of replacement should be more frequent, preferably no more than four hours; if the masks are wet, they should be replaced immediately to avoid bacterial growth. Provide 'beds'. The better the tightness, the more masks you need to breathe when you breathe, and the wearing time should be shortened accordingly. When you wear a mask, you should wash your hands first, and do not touch the inside of the mask to avoid secondary pollution; Put the nose, mouth, Fully wrapped around the chin and surrounding cheeks, tighten the nose clips, leaving no gaps. In addition, masks do not hoard, that is, buy it, otherwise it will be stored for a long time, it will breed bacteria.
In the selection of species, the current market mainly includes ordinary cotton masks, N95 professional dust masks, and medical disposable masks. The protective effect of cotton masks is minimal, and it can only block some dust and coarse particles. This type of mask is widely used, but there are no corresponding standards and rules, and it is not recommended for the elderly and children to use it regularly. Cotton masks can be sterilized every day by means of hot water, sun exposure, etc. Rub it hard.
Professional dust respirator seal effect is good, but breathing resistance is large, it is recommended to take half an hour after taking half an hour to breathe, long-term wear will damage the respiratory system, especially not suitable for the elderly, children, people with respiratory diseases. Have an exhalation valve The masks are suitable for use in special environments, such as in public places where there are many people, air quality is poor and circulation is not possible, there may be a large number of pathogenic bacteria.
Disposable medical masks are more resistant to bacteria than normal masks, but they do not block PM2.5. Sensitive groups such as the elderly and children can use it, but it is recommended to wear it for about 1 hour. Take off for a while.
