Air quality is good and bad, so that the public more worried, and if the home has a pet, or just finished decoration, air purifier will be put in use. Air purifier is a composite purification design, which integrates filtration and sterilization. But how can the purifier be differentiated? Don’t worry, Xiao Bian one to introduce to you. The air purifier according to the principle of work is divided into three categories, the first category is passive purification (purification filter), the second is active purification (no filter type), the third is double purification (purification active + passive purification). Passive purification mainly refers to the use of fans to pump air into the machine, through the built-in filter screen to filter the air, mainly to play the role of filtering dust, odor, toxic gas and killing some bacteria. The filter screen is divided into dust collecting screen, formaldehyde removing filter screen, deodorizing filter screen, HEPA filter screen, etc… Among them, the higher cost is the HEPA filter, which can play a role in the decomposition of toxic gases and bactericidal effects, especially to suppress the two pollution. These products are characterized by fan function and the quality of the filter screen, which determine the purification effect. Active sterilization principle can be divided into silver ion technology, negative ion technology, low temperature plasma technology, photocatalyst technology and net ion group ion technology. Such purifiers generally do not have a filter design, dust and odor in the air did not clear the effect. Brands include YADU, PHILPS, etc… The third type is the mainstream form at present, which is the double purification of the filter screen and sterilization technology. This kind of air purifier can be aimed at dust, pollution, peculiar smell and poisonous gas in the air all directional remove, representing brand to have SHARP and PHILPS to wait. For the purification effects of toxic gases hidden in the air, there will be corresponding national certification standards, when buying, we should pay special attention to. Buy air purifier to clean air purifier is only suitable for air purification in a small range, and also to a certain extent by temperature, humidity and other factors, so it can not completely rely on the air purifier to isolated". If you encounter air, low visibility or heavy fog, it is best to go out with a mask to prevent dust or bacteria breathing into the lungs, protect yourself. And when we are at home, it is best not to stay in a sterile state for a long time, so as not to reduce resistance!