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Ozone Layer Depletion

Ozone Layer Depletion. Causes and Associated Hazards. Stratospheric Ozone Layer Destruction. Ozone. O 3 a gas composed of three atoms of oxygen bluish gas that is harmful to breathe Nearly 90% of the Earth's ozone is in the stratosphere and is referred to as the ozone layer

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Ozone Layer Depletion

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  1. Ozone Layer Depletion Causes and Associated Hazards

  2. Stratospheric Ozone Layer Destruction

  3. Ozone • O3 • a gas composed of three atoms of oxygen • bluish gas that is harmful to breathe • Nearly 90% of the Earth's ozone is in the stratosphere and is referred to as the ozone layer • Ozone absorbs a band of ultraviolet radiation called UVB

  4. Ozone-Depleting Substance(s) (ODS): • CFCs • HCFCs (Hydro Chloro Fluorocarbon) • Halons ( A halon may be any of a group of organohalogen compounds containing bromine and fluorine and one or two carbons) • Methyl bromide • Carbon tetrachloride • Methyl chloroform

  5. Various sources

  6. CFCs • Most widely used ODs accounting for over 80% of total stratospheric ozone depletion. • Used as coolant in refrigerators, freezers and air conditioners in buildings and cars manufactured before 1995. • Found in industrial solvents, dry cleaning agents and hospital sterilants.

  7. Halons • Used in fire extinguishers. • These cause greater damage to the ozone layer than do CFCs from automobiles and air conditioners. EGEE 102 - Pisupati

  8. HCFCs • HCFCs have become major transitional substitutes for CFCs. • They are much less harmful to stratospheric ozone than CFCs are. • But HCFCs still cause some ozone destruction and are potent greenhouse gases.

  9. Methyl Chloroform • Used mainly in industry for vapour degreasing, some aerosols, cold cleaning, adhesives and chemical processing. EGEE 102 - Pisupati

  10. Carbon Tetrachloride • Used in solvents and some fire extinguishers.

  11. Effects of OLD • -- Skin Cancer (melanoma and nonmelanoma)-- Premature aging of the skin and other skin problems-- Cataracts and other eye damage-- Immune system suppression

  12. The Antarctic Ozone Hole • The ozone hole is defined as the area having less than 220 dobson units (DU) of ozone in the overhead column (i.e., between the ground and space). Source: http://jwocky.gsfc.nasa.gov/multi/recent_ozone91200.gif

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