Experts interviewed: Department of Respiratory Medicine, Zhongda Hospital, Southeast University
Deputy Chief Physician Han Shuhua
Special reporter of the newspaper Cui Yuyan
Cold currents, flu, pollen, air pollution...have people wearing masks. However, many people wear a mask for three or four days, or even blacken, and do not change their skin. Deputy Chief Physician, Department of Respiratory Medicine, Zhongda Hospital, Southeast University Han Shuhua told the “Life Times” reporter that wearing a mask for a long time would cause the gas exhaled in the mouth to attach to the inside of the mask. If it is not cleaned or replaced in time, bacteria can easily grow and cause harm to health. Contaminants accumulate on the mask and can also affect breathing. system.
Han Shuhua said that under normal circumstances, masks should be replaced 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 mask is wet, it should be replaced immediately to avoid breeding bacteria. 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 clip, 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 cotton masks have little protective effect and 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, respiratory diseases population. Have an exhalation valve 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 viruses than normal masks for bacteria, but they do not hinder 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. ▲
