Ozone layer depletion
- Ozone is a triatomic allotrope type of O2 that is unsteady. It is available in the climate for around 20kms above ocean level.
- Ozone is of imperative significance in shielding the world's surface from exposure to harmful ultraviolet radiations.
- The utilization of CFC in refrigerators and aerosols and their ensuing discharge into the air is responsible for making gaps in ozone layer over the antarctic and arctic areas.
- The different ozone depleting substances (ODS) are (i) CFC (ii) Halons (iii) Methyl chloroform (iv) carbon tetrachloride (v) HCFC
- Montreal protocal on substances that deplete the ozone layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion.
- Thickness of ozone is measured in Dobson units (D.V). The concentration of ozone is 0.3 PPm or 300 D.V in stratosphere.
- Protection against UV radiation is proportional to thickness of ozone layer.
- Helsinki declaration occured on May '89, where 82 nations pledged to phase out CFC's by 2000 A.D
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