Hole in the Ozone Layer Over Antarctica: View of planet Earth from space showing a hole in the ozone layer. "The blue/purple areas show low ozone, while the red areas indicate higher ozone levels. Although ozone is considered a pollutant in the troposphere, the atmospheric layer that contains the air we breathe, in higher altitudes, notably in the stratosphere, ozone is considered vital. Stratospheric ozone blocks harmful ultraviolet radiation produced by the Sun" (NASA Great Image Library).
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