Air purifier is also called the machine, the air cleaner, fresh air purifier, refers to the adsorption and decomposition or transformation of various air pollutants (generally include PM2.5, dust, pollen, peculiar smell, formaldehyde, decoration pollution, such as bacteria, allergens, etc.), effectively increase the air cleanliness of home appliance products, mainly divided into residential, commercial, industrial, building.

There are many different technologies and media in an air purifier that enable it to provide clean and safe air to its users. The commonly used air purification technologies are: adsorption technology, negative (positive) ion technology, catalytic technology, photocatalyst technology, superstructure photomineralization technology, HEPA efficient filtration technology, electrostatic dust collection technology, etc. Material technology mainly includes: photocatalyst, activated carbon, carbon core filter technology, synthetic fiber, HEAP efficient material, negative ion generator, etc. The existing air purifiers are mostly compound, that is, a variety of purification technologies and material media are used at the same time.