The Stratospheric Ozone Layer Its Photochemical Formation and Degradation

2 The Stratospheric Ozone Layer Its Photochemical Formation and Degradation 

Located several kilometres above the Earth s surface is the stratosphere. Here the ozone layer acts as a filter, protecting life on Earth from harmful low-wavelength ultraviolet radiation known as UV-C, which damages biological macromolecules such as proteins and DNA. In order to understand the effects of anthropogenic input into the stratosphere, the production and destruction of the ozone layer has been studied by a variety of photochemical models and experimental methods. 

Natural levels of catalytic radicals have been enhanced by the widespread use of chlorofluorocarbons (CFCs) and halons (e.g. CH3Br). This 

The international treaty known as the Montreal Protocol was signed in 1987, resulting in the phasing out of CFCs and other synthetic 

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