In hot, dry desert climates, or indoors in artificially heated spaces, during winter, for instance, the humidity may drop to as low as 10–20%. This low humidity can cause adverse health effects, by drying out mucous membranes such as the lining of the nose and throat, and can cause respiratory distress. The low humidity also can affect wooden furniture, causing shrinkage and loose joints or cracking of pieces. Books, papers, and artworks may shrink or warp and become brittle in very low humidity. In such situations, a humidifier is essential. There are various types but for homes, a portable humidifier may suffice. Xiaomi has just launched one, dubbed MIJIA Smart Sterilization Humidifier.
The MIJIA Smart Sterilisation Humidifier uses Ultraviolet C light to sterilize the water before it is used for humidification. UV-C is one of the three types of invisible light rays (together with ultraviolet A and ultraviolet B) given off by the sun. It is safe for humans but is highly effective at killing bacteria and viruses by destroying the molecular bonds that hold their DNA together.
Since tap water could contain bacteria and other contaminants, sterilizing the water is important. Even when purified water is kept in the tank for long, bacteria could grow inside. Thus, incorporating water sterilization on the Mijia humidifier is a good piece of engineering. Water released in the form of mist by the humidifier is clean and purified.
The Mijia intelligent sterilization humidifier water tank is expanded to a large capacity of 4.5L, which is equivalent to about 18 bottles of 250mL mineral water. Once added, it can be continuously humidified for 12-15 hours. The water tank adopts an overhead open design, and the large diameter is easy to clean to prevent water pollution when storing water. The storage tank isn’t detachable, just the cover can be removed if there is a need to refill or remove the water inside. 
The design also includes a LED light ring around the power button while there is a thin transparent strip on the body of the tank which turns blue when the UV-C sterilization is in action.
The Mijia intelligent sterilization humidifier utilises a high-frequency ceramic core atomization sheet which atomizes the water source into 1-5 micron particles and instantaneously erupts through the fog guiding channel, and the fog output is as high as 300mL/h.
The gadget can be connected to the MIJIA smart home app but you’ll likely need to connect it to the smart home hub. With such smart connectivity, you can turn on the device before you get home. 
It is presently available on Xiaomi Youpin (source link) for 249 yuan.
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