Yes, ozone is formed as a by-product of the corona-discharge process. It is an allotropic form of oxygen, and exists at room temperature as an unstable gas with a sharp, characteristic odour. It can usually be detected by its odour at concentrations as low as 0.01 to 0.05 ppm, which are below the permissible exposure level of 0.1ppm. Tantec supplies a standard range of ozone filters with flow sensors to control extraction air flows, and Tantec guarantees the ozone level in the working area is not exceeding the permissible exposure level.