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Welcome to the NAEI website
tratospheric ozone depletion
Actions on Stratospheric Ozone Depletion
1987 Montreal Protocol on Substances that Deplete the Ozone Layer
Ozone naturally occurs in the stratosphere (the higher layers of the earth's atmosphere) by the action of ultraviolet light from the sun on oxygen molecules. At this level, ozone has beneficial effects on health, in that it helps to filter out harmful ultraviolet rays that can cause skin cancers. Evidence suggests that stratospheric ozone depletion is being caused by man made emissions of chlorine and bromine-containing substances (halocarbons) such as: CFCs, halons, and HCFCs. HCFCs are similar to CFCs but have a lower potential for depleting ozone and in some cases are being used as transitional replacements. Emissions of methyl chloroform, carbon tetrachloride and methyl bromide also contribute to the effect.

More information on the impacts and problems associated with Stratospheric Ozone Depletion can be found from the following sites.


ARICS Encyclopedia of the Atmospheric Environment The Encyclopedia of the Atmospheric Environment is supported by the DEFRA. The Encyclopedia is a one-stop source of information, for younger and older users alike, on a range of atmospheric issues.

UK Stratospheric Ozone and UV Measurement Site

Stratospheric Ozone Depletion Pollutants

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