What harm does a humidifier do to the body?

In the north, the indoor humidity in autumn and winter is about 40%-60%. When the humidity in the air is lower than 20%, the amount of respirable particulate matter in the room increases, making people more likely to catch a cold. ; When the air humidity is 55%, germs are more difficult to spread; but if the air humidity is too high, such as more than 90%, it will cause discomfort to the human respiratory system and mucous membranes and reduce immunity, which is especially detrimental to the elderly and will induce People who suffer from flu, asthma, bronchitis and other illnesses, so those who use humidifiers are advised to purchase a hygrometer to control indoor humidity. People who already suffer from certain diseases should use humidifiers with caution. In addition, users of humidifiers should remember to maintain good ventilation at all times. \x0d\\x0d\Through investigation, the author learned that low-quality humidifiers often use low-quality electrical accessories, especially power cords. The outer skin can easily fall off to expose the copper core, causing leakage and electric shock, which puts consumers' lives in danger, especially for Children in the hyperactive stage and the elderly with limited mobility are at greater risk. Most inferior humidifiers do not have a "water shortage protection" function, or the water shortage protection is in vain, which can easily cause the machine to dry out, cause damage, and even cause a fire. Moreover, many of the fans of inferior humidifiers are not produced by regular manufacturers, which can easily leave fire hazards. \x0d\\x0d\In order to attract consumers at low prices, some inferior products blindly pursue cost reduction. Water tanks and plastic parts are made of inferior materials, which can easily lead to water pollution, odor and physical discomfort during use. Some manufacturers also use waste plastics, which not only have poor quality and are easy to break and break, but also easily cause secondary pollution due to unknown sources of raw materials. As a humidifier that improves indoor air quality, if more polluted plastics are used, "fog" pollution will occur, which will affect human health. At the same time, low-quality humidifiers will produce loud noises when they are running. The noise itself is also a kind of auditory pollution. If the noise is too loud, it will affect normal sleep and rest. \x0d\\x0d\Experts point out that in a dry environment, the resistance of the human respiratory system is reduced, which can easily cause or aggravate respiratory diseases. Dry air not only has an impact on physical health, but also has an adverse effect on the human body's immunity. ; Moreover, children’s respiratory volume is twice that of adults. In winter, the elderly and children spend less time outdoors. Therefore, compared with young and middle-aged people, the elderly and children are more susceptible to the harm of dry indoor air. If a low-quality humidifier is used, the pollutants produced will cause health hazards to the elderly and children, turning humidification into "bacteria addition." \x0d\\x0d\ Thirty years of research by Professor Sudo Chiharu in Japan who specializes in healthy environmental medicine research shows that the incidence of influenza, asthma, allergic dermatitis, emphysema, etc. is related to people living in low humidity for a long time since childhood. It is related to the decline of human immunity in the environment.