Ozone has been proven to kill 99.9% of pathogens in the air including SARS coronavirus and influenzas such as H5N1. Current research has shown this to be true for the COVID-19 virus.
Ozone destroys viruses by attacking the nucleic acid core, damaging the viral RNA. COVID-19 is an enveloped virus. Effectiveness of ozone against enveloped animal viruses has been supported by peer reviewed research for decades. Ozone renders other enveloped coronaviruses ineffective by attacking the envelope proteins, preventing the virus from attaching to normal, healthy cells. Without the ability to invade living cells, viruses are unable to infect by replication. It is plausible that ozone will also be effective at incapacitating COVID-19 as well.
This link will take you to a paper prepared by the US Army Public Health Center.
Jeff and Sjaan Armentrout