No they don't
Bunk (and not even "pure" bunk)! For real air purification you can either kill bacteria and mold or capture and remove dust with a true HEPA filter, or an ozone generator (always done in un-occupied rooms), but available scientific evidence shows that, at concentrations that do not exceed public health standards, ozone is generally ineffective in controlling indoor air pollution. Ozone has no effect on particulate allergens at all. Electronic Ionizers use an electronic process to reverse the charge of particles in the air. The charged particles are then attracted to collection plates in the air purifier, as well as to objects in the room, such as clothing, walls, floors and furniture. In effect, particles are removed from the air and deposited on your furnishings and clothing. To actually remove them from the room, you need to dust and vacuum to prevent allergens from being reintroduced into the air. The U.S. Environmental Protection Agency (EPA) has an excellent document titled "Residential Air Cleaning Devices: A Summary of Available Information"*. The EPA doesn't take a position either for or against home air cleaners, but states, "Some air purifiers, under the right conditions, can effectively remove certain respirable-size particles" (for example, larger tobacco smoke particles). Both the EPA and American Lung Association recommend that air purifiers be used as a last resort after allergen source control and ventilation. * "Residential Air Cleaning Devices: A Summary of Available Information". epa.gov/iaq/residair.html http://www.epa.gov/iaq/pubs/residair.html
