Ozone generators are optimized to attract an extra oxygen ion to an O2 molecule, using either a corona discharge tube or UV light. PlasmaTrue Technology is an ionizer which uses electrostatically charged plates to produce positively or negatively charged gas ions that particulate matter sticks to in an effect similar to static electricity. Some ionizers produce Ozone that can be harmful to your health; however, PlasmaTrue Technology has been tested and validated per the latest regulation to show that it does not generate harmful Ozone. The EPA has National Ambient Air Quality Standards for pollutants considered harmful to public health and the environment. These standards provide public health protection, including protecting the health of 'sensitive' populants such as asthmatics, children and the elderly. The AeraMax DX5/DX55/DX95 Air Purifier generates ozone far below the standard set by the EPA. In addition, the AeraMax DX5/DX55/DX95 Air Purifier is UL certified - testing well below the UL specification for ozone.