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'''Ozone''' is a chemical [[compound]] consisting of three [[oxygen]] atoms.  It is represented by the symbol O₃.

'''Ozone''' is a chemical [[compound]] consisting of three [[oxygen]] atoms.  It is represented by the symbol O₃.

It is unstable at standard temperatures and pressures, and a powerful [[oxidizer]].  At the earth's surface it occurs naturally as a result of electrical discharges, most prominently in the form of [[lightning]]. The majority of tropospheric ozone is created when [[volatile organic compounds]] (VOCs) and the products of combusted [[fossil fuel]] such as [[nitrogen oxide]] react in the presence of strong sunlight.

It is unstable at standard temperatures and pressures, and a powerful [[oxidizer]].  At the earth's surface it occurs naturally as a result of electrical discharges, most prominently in the form of [[lightning]]. The majority of tropospheric ozone is created when volatile organic compounds (VOCs) and the products of combusted [[fossil fuel]] such as [[nitrogen oxide]] react in the presence of strong sunlight.

In the stratosphere it serves a very important function, by acting to filter out most of the [[sun]]'s ultraviolet radiation.   

In the stratosphere it serves a very important function, by acting to filter out most of the [[sun]]'s ultraviolet radiation.