Bad odours are compounds, generally organic, suspended in the air. Ozone is a natural gas which, when it comes into contact with these compounds, oxidises them, transforms them into degraded sub-products which lose their odour. In other words, ozone acts as an odour destroyer, attacking directly at the origin of the problem. It does NOT mask them. By this same oxidation principle, it is recognised as a powerful gaseous sanitiser that quickly and effectively destroys viruses, bacteria, fungi and moulds.