1. PRESENTED BY
RINKU BALAN.K
MSc. COMPUTER SCIENCE
ST.JOSEPH’S COLLEGE
IRINJALAKUDA
KERALA

2. Ozone layer
• The ozone layer or ozone shield refers to a region of Earth's
stratosphere that absorbs most of the Sun's UV radiation.
• It protects humans and other organisms
from the UV radiation.
• It absorbs 97-99% of the suns high frequency ultraviolet light
which is potentially damaging to the life form on earth.

3. Ozone Depletion
Scientific evidence indicates that stratospheric ozone is being
destroyed by a group of manufactured chemicals, containing
chlorine and/or bromine. These chemicals are called "ozone-depleting
substances" (ODS).
The main ODS are:
• chlorofluorocarbons (CFCs)
• hydrochlorofluorcarbons (HCFCs)
• carbon tetrachloride
• methyl chloroform
• Halons (brominated fluorocarbons)

4. The Impacts of Ozone Depletion
Harm to human health.
• skin cancers, sunburns, cataracts, blindness.
Adverse impacts on agriculture, forestry
and natural ecosystems.
• major crop species are resulting in reduced
growth, photosynthesis and flowering.

5. Damage to marine life.
• plankton are threatened by increased UV radiation,
reduce fish yields.
Animals
• In domestic animals, UV overexposure may cause eye
and skin cancers.

7. • Minimize high altitude aircraft flights (oxygen reduction and
water vapor deposition)
• Minimize rocket flights (water vapor deposition)
• Encourage growth of plants that produce
oxygen, discourage deforestation
• Decrease / control releases of high temperature steam
/ moisture to the atmosphere
• Eliminate production and release of known ozone depleting
chemicals (such as CFCs and HCFCs) where remotely possible.
Subsidize production of safer alternatives where possible.

8. • Try to use products which are labeled
"Ozone-Friendly“.
• Ensure technicians repairing your
refrigerator or air conditioner recover and recycle the old CFCs so
they are not released into the atmosphere.
• Vehicle air conditioning units should regularly be checked for
leaks.
• Help start a refrigerant recovery and recycling program in your
area if none already exists.
• Replace halon fire extinguishers with
alternatives(e.g. carbon dioxide or foam).