It can purify the air and eliminate the dirty gas and peculiar smell in the air, which is another important standard of healthy air conditioning. Daqing Express Air-conditioner developed by Toshiba Company installed a sterilization plasma air purification device and a self-cleaning device inside the express air-conditioner. Plasma air purification device can not only absorb dust and pollen in the air, but also eliminate viruses in the air passing through the purification device. Hitachi has developed an air conditioner with an air purification filter. This air conditioning filter element has antibacterial and antiviral functions, which can eliminate 0.0 1 micron smoke. Daikin Company has developed an air conditioner that uses photocatalyst to purify the air. With titanium oxide as photocatalyst, a photocatalyst filter screen is produced, which has twice the dust collection and filtration capacity compared with the original air filter screen of the company, and has antibacterial and antiviral functions. Inhibition of mold propagation, killing indoor germs and viruses, with strong disinfection and sterilization functions, is the goal that Japanese air-conditioning enterprises have worked hard to achieve in recent years, and has become a hot topic of healthy air-conditioning in Japan. Among them, air conditioners produced by sterilization with positive and negative ion group technology are favored by consumers.
The so-called "strong sterilization technology of positive and negative ion groups" is to decompose water molecules into positive and negative ions through high-voltage discharge of ion generators. Because water molecules are wrapped by moisture, forming positive and negative ion groups, and then floating around in the air with water molecules as carriers, the sterilization ability is very strong. The air conditioner using this technology can inactivate influenza virus and inhibit the reproduction of Escherichia coli and black bacteria. The air conditioner with positive and negative ion group technology can keep the indoor air clean for a long time.