An air purifier is an indoor device that filters domestic or industrial air and is used primarily to remove pollution, improve air quality and purify the air. The purpose of this device is to limit the spread of harmful residues or allergens and to prevent asthma or allergy problems related to air quality in people at risk (children, the elderly, sensitive people, etc.). These devices can also be used preventively by people who do not have any particular problems but who wish to protect their health and that of their friends and family. This makes air purifiers, first and foremost, devices dedicated to combating ambient pollution and contributing to the improvement of indoor air quality.