Many more allergens are in carpets and furnishings than in the air. It removes at least 99 percent of the dust, dander, pollens, tobacco smoke and bacteria particles that are 0.3 microns or larger. Electronic air cleaners contain negative ion generators that charge the airborne particles. The particles are then attracted to charged metal plates or household surfaces. This type of air cleaner is less effective even at the beginning and can rapidly lose its efficiency unless regularly maintained.
Hybrid filters are air cleaners that are a combination of the other types of air cleaners.
Some air cleaners called ozone generators create ozone through an electrical charge. Ozone can be dangerous for persons with lung disease such as asthma and therefore ozone generators are not recommended. Control dust mites. Keep surfaces in the home clean and uncluttered. Bare floors and walls are best, particularly in the bedroom where you spend one-third of your time.