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Ozone in the ozone layer is formed when UV-C from the Sun dissociates an oxygen molecule, and some of those now-loose oxygen molecules connect with an oxygen molecule to form ozone. Ozone in a rain storm is made by lightning dissociating oxygen molecules, and the rest occurs as above. Ozone in tropospheric ozone pollution is directly made by internal combustion engines, but mostly by photoproduction when NOx (from combustion exhaust), and VOC (unburned fuel and "cow farts") are converted by purple or more energetic light into ozone and nitrogen gas (and the VOC just moves on). Ozone in medical / industry / water treatment is made either by UV lamps (for low concentrations) or by electrical discharge dissociating oxygen molecules, and the rest occurs as above. Ozone in the bloodstream is made by white blood cells (along with other powerful oxidants) in very tiny areas, when fighting infection at a site. The resultant of this fight is called "inflammation" or "swelling".

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15y ago

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