Ozone has also been proven to kill sarscov2, ebola, norovirus, hepatitis a & b among others. Naturally occurring, but also can be generated by ionic air filters in low (safe) amounts or in large amounts (can't find real sauce for what makes it unsafe other than the correlation between high amounts of smog/pollutants and ozone, but no studies on effects of pure ozone on lungs to be found) using portable ozone generators. It has also been used in therapies for degenerative disease like rheumatoid arthritis, degenerative disc disease, etc.
https://www.healthline.com/health/ozone-therapy