The airborne contamination is one of unavoidable problems and dangerous to human health that leads to many diseases such as respiratory infections, flu, allergies, etc. As a result, ozone is used for air disinfection system. Ozone has a gas status thus diffusion occurs more widely in any area than spraying liquid. So, spreading of ozone gas throughout any area is quite better than injecting or spraying liquid.

Ozone is an enormously powerful disinfectant and will oxidize in both organic and inorganic compound not only in water but also in air. It is a much stronger oxidizer than any other common disinfectants such as chlorine and hypochlorite. It is 3,125 time stronger and faster than chlorine which can kill or inhibit growth up to 99% of germs including bacteria, fungi and viruses. In addition, ozone also effectively eliminates all kinds of unpleasant odor. Ozone disinfection does not produce any harmful residues, and all the residual ozone will be converted into oxygen within a short time. Ozone is therefore considered as an environmentally friendly disinfectant.

According to the research article on disinfectant in air, the results of ozone-killing test in airborne virus showed that 99% of viruses were killed while using ozone treatment within 15 minutes (Chun-Chieh Tseng& Chih-Shan Li [2006]). Also, the results on the use of ozone to kill the virus in the flat material surface such as plastic glass and stainless showed that the duration of disinfection (contact time) at a concentration of 20 ppm ozone will take 20 minutes to kill the virus (Hudson [2009]).