Do not use an ionizer in an enclosed space when someone is present. Open a window or operate the ionizer when no one is home, turning it off when someone is in the room with it. Ionizers use negative ions to remove small particles from the air. This can help reduce odors and make the air appear fresher.
The problem with ionic air purifiers is that they emit ozone as a by-product of the charging process and ozone is harmful to health. As more information is disseminated and presented to the public about the dangers of air ionizers, the more informed consumers will be before purchasing an air purifier, and they are likely to be aware of and avoid these potentially hazardous ionizing air systems.