Ozone's O 3 structure was determined in 1865. Ozone's odour is reminiscent of chlorine, and detectable by many people at concentrations of as little as 0.1 ppm in air. It is present in very low concentrations throughout the latter, with its highest concentration high in the ozone layer of the stratosphere, which absorbs most of the Sun's ultraviolet (UV) radiation. Ozone is formed from dioxygen by the action of ultraviolet (UV) light and electrical discharges within the Earth's atmosphere. It is an allotrope of oxygen that is much less stable than the diatomic allotrope OĢ, breaking down in the lower atmosphere to OĢ ( dioxygen). It is a pale blue gas with a distinctively pungent smell.
Ozone ( / ˈ oʊ z oʊ n/) (or trioxygen) is an inorganic molecule with the chemical formula Oģ.
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