As the weather turns hot, blowing air conditioners becomes an indispensable part of everyday life. To prevent excessive drying, many people put a humidifier in the room to ease the drying problems caused by air conditioning. However, some voices have recently appeared on the Internet: "Adding tap water to a humidifier to atomize it is equivalent to smothering." Is this true?
According to Zhao Feihong, president of the Beijing Health Protection and Health Association's Healthy Drinking Water Committee, “Humidifiers generally require pure water. When using tap water, the humidifier will form scales and block the mouth of the humidifier. At the same time, calcium and magnesium ions and other 'impurities' exist in tap water. When these 'impurities' are sprayed, they form particulate matter, and after drying, they leave behind a layer of white powder. The current air purifiers use particulate matter as the testing standard, so they think that indoor pollution is serious, but this 'pollution' and fog "The haze is not the same. Haze is the attachment of harmful substances to particulate matter. Long-term inhalation can easily cause lung cancer."
Why do some people find that the PM2.5 detector has risen after using a humidifier with tap water? Daily use of PM2.5 detector using "light scattering method", all aerosol particles are its detection object, which itself is unable to identify water vapor and harmful particles. In theory, the particle content of 2.5 μm or less is the PM2.5 index. The humidifier produces water vapor particles with the size of 0.5-10 μm. A considerable part of the water vapor particle size is close to the fine particles. It is not surprising that readings will rise straight.
Despite this, we must be careful about the health risks. Peng Yingdeng, a researcher at the National Urban Environmental Pollution Control Technology Research Center, said that tap water contains calcium and magnesium ions and some impurities, and that these impurities do have a certain negative impact on physical health after being sprayed with mist. Therefore, Peng Yingdeng suggested that it is better to use less contaminated, safer distilled water or pure water, and use tap water as little as possible. In addition, the humidifier needs regular cleaning. Because it is not cleaned for a long time, the internal residual moisture will gradually become a hotbed for the growth of bacteria, mold, and so on. In addition to regularly cleaning the humidifier and changing the water, the humidifier should be thoroughly cleaned and stored after the humidifier is not used.
Dr. Zhao Zhuohui from the School of Public Health at Fudan University believes that many people have many misunderstandings regarding the rational use of humidifiers. For example, the relative humidity in the indoor environment is not as high as possible. Under certain conditions, water mist can facilitate the spread of bacteria, leading to a series of health problems including “humidifier pneumonia”. In addition to some humidifiers on the market that take heat to generate water vapor, there is an ultrasonic principle that uses high-frequency oscillations to atomize the water, thereby allowing moisture to diffuse into the air. However, as far as the latter is concerned, white fog may be produced. This kind of white fog, which is essentially water vapor, can adsorb toxic contaminants such as molds, bacteria, and decoration in the air. The bacteria-containing water mist may affect some vulnerable people. People with chronic respiratory diseases, such as people with allergies such as asthma, bronchitis, and chronic obstructive pulmonary disease, may have adverse effects.