Hello! Yes, "ozone" is a real word, I found this in MWebster: 1 : a triatomic very reactive form of oxygen that is a bluish irritating gas of pungent odor, that is formed naturally in the atmosphere by a photochemical reaction and is a major air pollutant in the lower atmosphere but a beneficial component of the upper atmosphere, and that is used for oxidizing, bleaching, disinfecting, and deodorizing 2 : pure and refreshing air The point is "ozone" surely doesn't exist in the plural, no more than "oxygene"; there's only one of their kind...
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Ozone can also refer to the individual molecule, which CAN be pluralized. So ozones is a valid word if referring to the molecule and not the ozone layer