Puraclenz products, unlike any other ionic air purifier, are certified ozone free and meet UL2998 standards. Puraclenz products feature a shielded UV lamp that emits no wavelengths less than 250nm. Puraclenz products do not release ozone since ozone is formed by light with a wavelength of 185nm. Puraclenz products allow you to breathe better air within your house while avoiding the negative impacts of ozone pollution.