Haze is a combination of fog and haze. Smog is common in cities. Many regions in China combine fog with haze as a disastrous weather phenomenon for early warning and forecasting, collectively known as “haze weather”. Recently, the haze in the north is serious. Yesterday, there was continuous fog with visibility below 500 meters in Harbin, accompanied by heavy haze; The local visibility in the main urban area is less than 200 meters.
The harm of haze is well known. It may cause acute upper respiratory tract infection (cold), acute tracheobronchial inflammation, pneumonia, asthma attacks, and induce or aggravate chronic bronchitis. In particular, the nasal, tracheal and bronchial mucosa of children’s respiratory tract is tender, and the number of alveoli is small. The elastic fibers are poorly developed, and the stroma is vigorous. They are more vulnerable to respiratory virus infection. People living in fog for a long time can cause tracheitis, laryngitis, pneumonia, asthma, rhinitis, conjunctivitis and allergic diseases, which have a certain impact on the growth, development and physique of children and adolescents. In addition, diabetes patients with poor air quality and resistance in foggy weather are very likely to suffer from lung and tracheal infections and aggravate their conditions.
Can the air purifier really achieve the magic effect of filtering PM2.5? Li Xiaoqun, a researcher at the Jilin Academy of Social Sciences, held a negative attitude. He said that the existing air purifiers basically do not work on PM2.5, and only the most advanced ones are really effective. Even if it can be filtered out, it is only in a small range. The whole room can’t be filtered out. You can’t listen to what the salesperson says. Sometimes the salesperson exaggerates in order to sell things.
Experts said that ozone itself is a pollutant, and the principle of adsorption materials is the same as that of drinking water purifiers. It is necessary to change the adsorption materials frequently, otherwise it will release harmful substances again as a pollution source. Liu Jingsheng, deputy director of the virus prevention and Control Institute of the Hebei disease control center, believes that consumers who buy purifiers simply for smog weather are more at ease than healthy. In fact, in addition to extreme smog weather, opening windows for ventilation is still more effective than opening machines.
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