portable air purifier.The water mist of ultrasonic humidifiers appears to be effective

　　In winter in Guangdong, one can experience the changes of the four seasons within a day. When one first wakes up, it is so cold that one shivers. If there is a wind and leaves fall, it feels like autumn has arrived. At noon, the bright sun makes one want to travel light. In the winter of Guangdong, how to wear clothes to adapt to changes in temperature has become something that needs to be considered.

　　Simply being cold can handle it, just add scarves, gloves, hats, and cotton clothes to your body, but if it's dry and cold, it's really frustrating. A few days ago, most parts of Guangdong experienced a "surface explosion" of dryness and coldness, with relative humidity reaching a new low since autumn. On New Year's Day, it was even drier than Beijing. Dry weather can bring many problems, such as the easy generation of static electricity, causing fires, and the discomfort of dry mouth and tongue in the human body. Especially when staying in a room with heating for a long time, suitable temperature and humidity provide favorable conditions for the reproduction of bacteria, which can easily lead to colds and respiratory diseases. Slight carelessness can easily lead to fire, causing sores in the mouth and nose, as well as dry and itchy skin, cracked lips, and other problems.

　　70% of the human body is composed of water, and dryness means a lack of moisture. Insufficient humidity. In addition to daily drinking water, humidifiers are also an effective way to increase humidity in the air. There are various types of humidifiers on the market, with ultrasonic and evaporative being the two most common types.

　　The working principle of ultrasonic type is to generate ultrasonic waves through high-frequency oscillation of the atomizer, and then use ultrasonic waves to break water powder into small particles of 1-5 microns. This water mist is blown into the air, increasing air humidity. The scenes where we often see smoke swirling like fairyland can be achieved not only with dry ice, but also with ultrasonic humidifiers. Generally speaking, this type of humidifier has a higher humidification rate and lower power consumption and price. The general price range is 100-1000 yuan.

　　But if tap water is added to the ultrasonic humidifier, the water mist produced by ultrasonic vibration will evaporate and carry a large amount of calcium and magnesium ions, which will react with carbon dioxide in the air and deposit in the room to form a white powder. If the human body is exposed to this environment for a long time, inhaling these particles into the respiratory system, especially for people with sensitive respiratory tract, can cause health problems. The only way to reduce this problem is to replace the water in the humidifier with pure water, but it is still not possible to achieve an absolutely clean state, so it is not very realistic. Ultrasonic humidifiers are indeed a significant pain point in this issue.

　　In contrast, the editor recommends evaporative humidifiers, a healthier and cleaner way of humidification. Evaporative humidifiers do not produce fog or water vapor, nor do they form white powder in the air, so this type of humidifier does not have high water quality requirements and can directly use tap water. The principle of an evaporative humidifier is to simulate the evaporation phenomenon in nature, accelerating the evaporation rate of water through the evaporation core, thereby achieving a fast and uniform humidification effect. The price is generally higher, ranging from 400 to 3000 yuan, and regular cleaning and replacement of the evaporative water core are required.

　　However, evaporative humidifiers are not so perfect and may still have some flaws. The biggest problem is the exposed water tank design, where dust, bacteria, and other substances in the air can directly enter the tank, providing a breeding ground for bacteria. Prolonged cleaning and maintenance of the water tank may also allow mosquitoes and insects to breed freely inside. Another issue is that the evaporative humidifier has a built-in motor, so the noise is also higher, but these issues can be controlled and resolved.

　　Some evaporative humidifiers nowadays have made improvements to the product details to address noise issues, using plastic gears to reduce noise. Of course, noise cannot be completely avoided. The problem of cleaning the water tank is also artificially controllable. As long as the water is changed and cleaned frequently, it can greatly avoid the problem of bacteria and mosquitoes breeding. Some humidifiers also add sterilization functions, providing health protection.

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