Ozone is commonly used to eliminate mold, and to stop mold from growing. A new trend and industry is the industrial growing of cannabis. In this application mold growth can be a major issue. Article below gives some great info on the use of ozone to eliminate mold growth in this industry:
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Mold-rated UV-C lights are great mold protection in other parts of the garden as well. Placing UV-C lights in front of HEPA filters in air intakes assures that the mold spores it captures do not turn the filter itself into a breeding ground. In addition, shine UV-C light on the cooling tubes and drip pans of your air-conditioning unit to assure that mold does not proliferate in these high-risk areas.
Use precaution when handling UV lamps. Do not let the light shine on any part of your body; it may present a hazard to your skin. Additionally, UV lights present a danger to your respiratory system due to the formation of ozone. Ultraviolet light reacts with molecular oxygen (O2) to form ozone (O3) in small quantities. Ensure that any area under UV irradiation has an adequate airflow. Regulations state that workplace or residential atmospheres must not exceed a level of 50 parts per billion of ozone. Any grow operation that wishes to withstand OSHA regulations must measure ozone concentrations in UV-irradiated areas to assure they do not exceed 50 ppb, as higher concentrations present a health hazard. Ozone tests can be expensive, so try and use your nose first; if you are able to smell the ozone (a smell reminiscent of laser printers in use), you definitely need more ventilation.