Depletion of Stratospheric Ozone Layer from Photochemical Degradation

2 Depletion of Stratospheric Ozone Layer from Photochemical Degradation 

The stratospheric region of the atmosphere is located above 15—35 km from the surface of the earth. It contains a deep layer of ozone that acts as a filter of harmful UV radiation of sunlight to reach the earth s surface and thus protects us from hazardous effect of UV radiation. The massive loss of ozone in the stratosphere occurs daily by atmospheric pollutants, UV-induced photolysis of ozone in the presence of man-made chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), halons (brominated hydrocarbons), CCU, and methylchloroform (CH3CCI3). These halocarbons generate halogen radicals which have active roles for photolysis of ozone. These are also derived from gaseous chlorine and hydrochloric 

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