ozone layer depletion presentation for college students. in this presentation i discuss all the important fact about ozone layer depletion. i cover all the important topic related to ozone layer depletion causes.

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Ozone Layer
Depletion
S A V E E A R T H S A V E L I F E

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INDEX
1.What is ozone layer
2.What is ozone layer depletion
5.Causes of ozone layer depletion
6.Effects of ozone layer depletion
7.Solution to ozone layer depletion
4.Ozone Depleting Substances (ODS)
3.What is ozone hole

3. What is Ozone Layer?
The ozone layer is mainly found in the stratosphere
of the earth’s atmosphere. It has the potential to
absorb around 97-99% of the harmful ultraviolet
radiations coming from the sun that can damage life
on earth.
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The ozone layer is located at an altitude of about 10
to 50 km above the earth's surface.

4. Ozone layer depletion means the thinning of the ozone
layer present in the upper atmosphere. That is harmful to
nature and the atmosphere caused due to the release of
chemical compounds containing gaseous bromine or
chlorine from industries or other human activities.
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WHAT IS OZONE LAYER
DEPLETION?
Chlorofluorocarbons are the most abundant ozone-
depleting substance.

5. The region of the depletion of ozone in the ozone layer
is called the ozone hole. Though it is a region it is still
termed as the hole. This region is over Antarctica. The
increase in heat and depletion of ozone around the
Earth's Polar Regions is called the ozone hole.
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WHAT IS OZONE HOLE
This ozone hole leads to melting of ice of Antarctica,
increase in sea level and other harmful effects on it's
environment.

6. “Ozone-depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons,
etc. that are responsible for the depletion of the ozone layer.”
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OZONE DEPLETING SUBSTANCES (ODS)
Chlorofluorocarbons (CFCs) Refrigerators,
air-conditioners, solvents, dry-cleaning
agents, etc.
Halons : Fire-extinguishers
Hydrofluorocarbons : fire extinguishers,
air-conditioners, solvents
Methyl chloroform : Adhesives,
aerosols
Carbon tetrachloride : Fire
extinguishers, solvents

7. The main causes responsible for the depletion of the ozone layer are listed below.
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CAUSES OF OZONE LAYER DEPLETION?
Chlorofluorocarbons:
Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released
by solvents, spray aerosols, refrigerators, air-conditioners, etc.
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.
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.
The volcanic eruptions are also responsible for the depletion of the ozone layer.

8. Let us see the major effects of ozone layer depletion on man and environment
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EFFECTS OF OZONE LAYER DEPLETION?
Effects on Human Health
Humans will be directly exposed to the harmful ultraviolet radiation of the sun due to the
depletion of the ozone layer. This might result in serious health issues among humans, such as
skin diseases, cancer, sunburns, cataract, quick ageing and weak immune system.
Effects on Animals
Direct exposure to ultraviolet radiations leads to skin and eye cancer in animals.
Effects on the Environment
Strong ultraviolet rays may lead to minimal growth, flowering and photosynthesis in plants.
The forests also have to bear the harmful effects of the ultraviolet rays.

9. EFFECTS OF OZONE LAYER DEPLETION?
Effect On Aquatic System
Effects on Climate
Effects on Materials
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Affects phytoplankton, fish, larval carbs. Decrease in amount of phytoplankton increase
the Cₒ₂ in atmoshphare which contribute the global warming
Global Warming (Increasing the average temprature of the earth's surface).
Degradation of paints and plastics.

10. The depletion of the ozone layer is a serious issue and various programmes have been launched
by the government of various countries to prevent it. However, steps should be taken at the
individual level as well to prevent the depletion of the ozone layer.
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SOLUTION TO OZONE LAYER DEPLETION?
Following are some points that would help in preventing this problem at a global level..
Avoid Using ODS (Ozone Depleting Substances)
Reduce the use of ozone depleting substances. E.g. avoid the use of CFCs in
refrigerators and air conditioners, replacing the halon based fire extinguishers,
etc.

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The vehicles emit a large amount of greenhouse gases that lead to
global warming as well as ozone depletion. Therefore, the use of
vehicles should be minimised as much as possible.
Minimise the Use of Vehicles
Use Eco-friendly Cleaning Products
Most of the cleaning products have chlorine and bromine
releasing chemicals that find a way into the atmosphere and affect
the ozone layer. These should be substituted with natural products
to protect the environment.

12. The Montreal Protocol on Substances that Deplete the
Ozone Layer is the landmark multilateral environmental
agreement that regulates the production and consumption
of nearly 100 man-made chemicals referred to as ozone
depleting substances (ODS). When released to the
atmosphere, those chemicals damage the stratospheric
ozone layer, Earth's protective shield that protects humans
and the environment from harmful levels of ultraviolet
radiation from the sun. Adopted on 16 September 1987, the
Protocol is to date the only UN treaty ever that has been
ratified every country on Earth - all 198 UN Member States.
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MONTREAL PROTOCOL

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