Be aware that ozone, once created, may sometimes drift through the air for long distances, so that if it is not diluted by fresh air, a hazard may exist far from the point of ozone generation. Arc welding is considered to be the highest-risk occupation because of the high levels of ozone that may be unintentionally generated. Corona devices on photocopy machines allso create small amounts of ozone, although single machines operating properly do not produce sufficient ozone to create a health hazard. But there are many other industries where ozone is, intentionally or unintentionally, produced. Ozone generating ultraviolet lights are made for purifying drinking water and water for swimming pools, hot tubs and spas.
Ozone is used as a disinfectant for stored food, animal by products, and sewage.
It is used as a bleaching agent for bleaching textiles and paper pulp. And the manufacture and testing of the ultraviolet lights used to make ozone may itself create hazardous levels of ozone. Even in small amounts it is one of the most potently toxic substances known to the lungs. And the symptoms that result from breathing th ozone may be delayed for minutes to hours after the exposure occurs. In addition, your sense of smell 'adapts' to ozone rapidly, so that you may smell it when you first walk into a room, but soon become entirely unaware of its presence.