  ozone  (systematically named 1Î»1,3Î»1-trioxidane and catena-trioxygen), or trioxygen, is an inorganic molecule with the chemical formula  (also written ). it is a pale blue gas with a distinctively pungent smell. it is an allotrope of oxygen that is much less stable than the diatomic allotrope , breaking down in the lower atmosphere to normal dioxygen. ozone is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges, and is present in low concentrations throughout the earth's atmosphere. in total, ozone makes up only {{val|0.6|u
Allotropes Disinfectants Environmental_chemistry Gases Greenhouse_gases Industrial_gases Oxidizing_agents Oxygen Ozone