Ozone disinfection (Production Pollution Control, PPC) produces UV light under controlled conditions which, in combination with the natural oxygen in the air, generates pure ozone (without nitrogen oxides). Ozone has the property of combining with organic osmogens (odorous substances) and oxidising them. In the process, microorganisms in the air and on surfaces, such as germs, bacteria and fungal spores, are also inactivated. The residual product after oxidation is oxygen again; there are no harmful by-products.
If room air and surfaces are to be disinfected, a larger quantity of ozone is generated. This is because while simply structured microorganisms are highly sensitive to ozone and can easily be deactivated with a low dose, much greater energies are needed to kill fungi and spores.