[real-time] expert reminds you to pay attention to the three points when buying anti-mite masks

The degree of harm to smog is not the same for everyone. People in the population are particularly sensitive to smog, such as children, the elderly, chronic heart and lung disease, and low socioeconomic status (such as lower educational background or income level). ), diabetics and obese people.

What effect does PM2.5 have on the human body? PM2.5 enters the lungs to block the local tissue, which can reduce the ventilation function of the local bronchus and reduce the ventilation of the bronchioles and alveoli. PM2.5, which adsorbs harmful gases, can stimulate or corrode the alveolar walls. Long-term effects can damage the respiratory defense system and cause bronchitis, emphysema, and bronchial asthma. A large number of epidemiological studies have found that both short-term and long-term exposure to high concentrations of particulate matter can increase the incidence of respiratory diseases and mortality in the population.

Professor Wang Jian, director of the Department of Respiratory Medicine at the Shanghai Ninth People’s Hospital, introduced that compared with adults, children as a group with weaker physical status have lower levels of immunity and weaker resistance due to the fact that their organs are not yet fully developed.霾 The weather is more vulnerable to harmful substances in the air. At the same time, the children's nasal cavity is shorter than adults, and the upper airway is less vulnerable to foreign invasion and is more sensitive to bad weather. In hazy weather, various harmful substances carried by PM2.5 particles can easily cause respiratory diseases such as rhinitis, bronchitis, and asthma, and can also cause damage to the mucosa of the respiratory system.

Of course, this is not to say that PM2.5 levels have risen, and these respiratory diseases have become apparent. Bao Yixiao, director of the Department of Pediatrics of Xinhua Hospital, Shanghai Jiaotong University School of Medicine, said: “Some phenomena are suggesting that the effects of PM2.5 have a lagging effect.” That is to say, for example, on the day when PM2.5 was high in concentration, asthma patients were not seen. many. "We have had contact with this. When the PM2.5 is high, many people will ask if the outpatient amount has increased substantially. This is not the case."

Studies have shown that the impact of PM2.5 will show up after one week. But to say how much impact, it is not necessarily. This is now the season of alternating hot and cold, and hot and cold weather will have aggravated the incidence of respiratory diseases. The effects of haze have, but not necessarily, decisive factors.

For parents, the most important thing is to do protective measures for the children. In smog days, try to reduce going out. If you want to go out, you should choose a mask with good texture to block PM2.5. As for how to choose masks? Zhao Zhexin, a child protection products engineer, points out that there are usually three things to keep in mind:

First, an efficient PM2.5 filter membrane effectively prevents PM2.5 and fine particulates from entering the body.

Second, good facial fit prevents air leakage. Because the facial structure is three-dimensional, and each person's facial contour is quite different, the traditional anti-caries mask is difficult to achieve close contact with the face, resulting in air leakage, so that the anti-mite effect is greatly reduced.

Third, good air permeability can be worn for a long time without getting bored. Nowadays, anti-fog and smog masks on the market are predominantly industrial dust masks. Although they have good filtering efficiency, they have great resistance to breathing and should not be worn for longer than half an hour each time. Therefore, they should be carefully considered when selecting.

Of course, what needs to be reminded is that all the anti-mite items need to be replaced in time, otherwise they will not be protected.