Uv rays

1. COURSE TITLE: ENVIRONMENTAL STUDIES
TOPIC: OZONE LAYER DEPLETION
SUBMITTED TO: MS. IPSHITA MATTA
SUBMITTED BY: KOMAL ( ROLL NO. – 23508300049
CLASS- M.COM (FYIP) SEM-III

2. TABLE OF CONTENT
• Definition
• Cause
• Impact on human
• Impact on Environment
• Recent Report Review

3. DEFINITION
• “The ozone layer is a region in the earth’s stratosphere that contains high
concentrations of ozone and protects the earth from the harmful ultraviolet radiations
of the sun.”
• If the ozone layer was absent, millions of people would develop skin diseases and
may have weakened immune systems.

4. CAUSE OF OZONE DEPLITION
1. Chlorofluorocarbons
Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray
aerosols, refrigerators, air-conditioners, etc. The molecules of chlorofluorocarbons in the stratosphere are
broken down by ultraviolet radiations and release chlorine atoms. These atoms react with ozone and destroy it.
2. Unregulated Rocket Launches
Researches say that the unregulated launching of rockets results in much more depletion of the ozone layer than
the CFCs do. If not controlled, this might result in a huge loss of the ozone layer by the year 2050.

5. CAUSE OF OZONE DEPLITION
3. Nitrogenous Compounds
The nitrogenous compounds such as NO2, NO, N2O are highly responsible for the depletion
of the ozone layer.
4. Natural Causes
The ozone layer has been found to be depleted by certain natural processes such as Sun-
spots and stratospheric winds. But it does not cause more than 1-2% of the ozone layer
depletion.

6. CAUSE OF OZONE DEPLITION
Ozone Depleting Substances (ODS)
“Ozone-depleting substances are the substances such as
chlorofluorocarbons, halons, carbon tetrachloride,
hydrofluorocarbons, etc. that are responsible for the
depletion of the layer.

7. IMPACT ON HUMAN
• Ozone depletion can cause increased amounts of UV radiation to reach the
Earth which can lead to more cases of
• 1. Skin cancer: Ozone depletion increases the amount of UV radiation that
reaches the Earth’s surface, which can lead to more cases of skin cancer,
including melanoma, the most fatal type.
• 2. Cataracts: UV radiation can cause cataracts, which are the leading cause of
permanent blindness worldwide.
•

8. IMPACT ON HUMAN
• 3. Impaired immune systems: UV radiation can impair the
immune system.
• 4. Sunburn and Snow Blindness: Overexposure to UV-B
radiation can cause sunburn and snow blindness.

9. IMPACT ON HUMAN
• 5 Cough and Sour throat: ozone depletion can cause coughing and a
scratchy or sore throat.
• 6. Inflammation of airways: ozone depletion can cause inflammation
of the airways and damage to the lungs, making them more susceptible
to infection.

10. IMPACT ON ENVIRONMENT
• Ozone layer depletion has many negative impacts on the environment
including:
• 1.Increased UV radiation: Ozone depletion allows more UV radiation to
reach the Earth’s surface, which can damage human health, plants animals,
and microbes.
• 2. Plant growth: UV radiation can inhibit the growth of plants, which can
reduce agricultural productivity and lead to a loss of plant species.

11. IMPACT ON ENVIRONMENT
• 3. Aquatic life: UV radiation can damage aquatic life, especially those near the
water’s surfaces, which are the basis of the food chain.
• 4. Animal health: UV radiation can cause cancer in domestic animals.

12. RECENT REPORTVIEW
• According to recent report, the ozone layer is healing and is expected to recover
to 1980 levels by 2066
• 1. Ozone hole size:
• The 2024 ozone hole was smaller than other years, ranking as the seventh
smallest since 1992. the hole is expected to close towards the end of November
under normal conditions.

13. RECENT REPORTVIEW
• 2 Impact on climate change:
• The recovery of the ozone layer is helping to avoid global warming by 0.5 .
℃
• 3. Ozone layer recovery:
• The ozone layer is recovering due to the success of the Montreal Protocol, which has led to the
phase out of the nearly 99% of banned ozone-depleting substances.

14. Thankyou