its about ozone layer

1. OZONE
DEPLETION
Environmental
Studies

2. OZONE LAYER
The ozone layer is the common term for the high concentration of
ozone (O3) that is found in the stratosphere around 15–30km above
the earth’s surface. It covers the entire planet and protects life on
earth by absorbing harmful ultraviolet-B (UV-B) radiation from the
sun. It effectively blocks almost all solar radiation of wavelengths
less than 290 nanometers from reaching Earth’s surface and other
forms of radiation that could injure or kill most living things.
World Ozone Day is observed on September 16, every year.

3. USES OF THE OZONE LAYER
 Ozone is harmful at ground level but high up the atmosphere
ozone layer plays a vital role in the protection of all living
beings.
 This layer absorbs the radiations and prohibits them from
entering the outer surface of the earth.
The layers which occupy the lower part of the atmosphere
removes the unwanted pollutants from the earth’s surface.
Ozone layer protects us from various skin diseases and cancer.

4. DEPLETION OF THE
OZONE LAYER –
THE OZONE HOLE

5. OZONE LAYER DEPLETION IN 2021
The 2021 ozone hole
evolution appears to be
similar to last year’s size,
currently around 23
million sq km – reaching
an extent larger than
Antarctica. According to
CAMS, the 2021 ozone
hole has considerably
grown in the last two
weeks and is now larger
than 75% of ozone holes
at that stage in the season

6. CAUSES OF OZONE DEPLETION
The reason behind the ozone layer depletion is mainly due to the
extensive use of ozone-depleting substances. Some ozone-depleting
substances are:
Ozone-Depleting Substances Sources
Chlorofluorocarbons (CFCs) Refrigerators, air-conditioners,
solvents, dry-cleaning agents, etc.
Halons Fire-extinguishers
Carbon tetrachloride Fire extinguishers, solvents
Methyl chloroform Adhesives, aerosols
Hydrofluorocarbons fire extinguishers, air-conditioners,
solvents

7. IMPACTS OF OZONE DEPLETION
 Harmful to human health – causes skin and eye diseases
 Adverse impact on agriculture and crop production
 Physiological and developmental effects on plants
 Affects animals on land and marine animals
 Affects materials like wood, plastic, bricks, rubber, fabric etc
 Increase in UVB radiation could affect terrestrial and aquatic
biogeochemical cycles

8. HOW TO PREVENT OZONE
DEPLETION
SELF MEASURES :
 Avoid the consumption of gases dangerous to the ozone layer in
industries
 Minimize the use of cars, air conditioners, refrigerators etc
 Do not use cleaning products that are harmful to the environment
and to us
 Avoid pesticides
 Prohibit the use of Nitrogen oxides
INTERNATIONAL MEASURE :
Montreal protocol – 1987, comprises of 197 countries to reduce the
use of CFC substances

9. CONCLUSION
Stopping the rapid decline in ozone layer is as much the
responsibility of the civil society as it is of governments and
scientists. We can see to it that we limit private vehicle
travelling, use eco-friendly cleaning products and avoid
chemical pesticides and weedicides.
Ozone layer is the protective shield of the Earth. We have to
ensure that the hole in this ‘shield’ doesn’t get bigger,
otherwise all life on Earth would perish owing to the wrath of
the sun, in the form of UV rays.

10. THANK YOU
Adishree Ajith
II BSW
2001721049001