An air purifier is a device that removes contaminants from the air in a specific room to improve indoor air quality. It works by using an internal filter and fan to pull in unwanted particles from the air, and then circulates the purified air back into the room. The filtration process repeats several times an hour, continually boosting indoor air quality
. Air purifiers are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke
. There are different types of air purifiers, including mechanical filters, electrostatic precipitators, and plasma air purifiers, each using various technologies to filter the air
. It's important to choose an air purifier that matches your specific indoor air quality needs and the size of the room where it will be used
