When the indoor air humidity is lower than 40%, dust, bacteria, etc. Simply attaching to mucous membrane will affect throat, cause cough, and simply induce respiratory diseases, such as bronchitis and asthma. Influenza viruses multiply rapidly in a boring environment, and can also cause allergic dermatitis, skin itching and other symptoms.
An environment with excessive humidity is also not conducive to human health. At a certain temperature, the greater the relative humidity of the air, the slower the transpiration of human sweat, which makes people feel sticky and uncomfortable. People may feel nausea, loss of appetite, irritability, fatigue, dizziness and so on. After a long time, they may simply have rheumatoid arthritis. In the high humidity environment, mold and so on are also easier to reproduce, threatening human health.