I find ozone quite an interesting gas. It can be generated on demand electrically by either plasma or UVC and has a bleachlike odour and a very strong oxidising effect.
The oxidising effect is used to neutralise airborne odours like cigarette smoke and undesired odours in public toilet facilities. It has to be used in moderation, since too much ozone can cause irritation.
Ozone is not a fix for the mouldy smell associated with furnishings that have been damp for a period of time. The best fix there is to remove the affected material.
Ozone is also used as an alternative to detergent in some laundry equipment due to its ability to clean and sterilise fabrics when diffused in water. Some machines offer a dry cycle too that tumbles the clothing in ozone to freshen it up.
The gas is controversial in that some people believe that low levels are safe, while others believe that any level is harmful. It does occur naturally in nature, notably after a thunderstorm.
Some materials like rubber can be damaged by overexposure to ozone through rapid oxidation. Laundry equipment using the gas has to be made from materials like stainless steel and silicone.
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