The document discusses the ozone layer, the Montreal Protocol, and measures to preserve the ozone layer. It notes that the ozone layer protects the Earth from harmful UV radiation and was being depleted by manmade chemicals like CFCs. The 1987 Montreal Protocol was a landmark agreement that regulated ozone-depleting substances and has been ratified by 197 countries. The protocol and national measures like India's participation have helped to implement regulations to phase out chemicals threatening the ozone layer and allow its recovery.

1. A World of 8 Billion
World Ozone Day
Dr. Namdev V. Telore
Professor, Dept of Geography
Raja Shripatrao Bhagwantrao Mahavidyalaya, Aundh, Satara
https://vidwan.inflibnet.ac.in/profile/159877
Prof. Sambhajirao Kadam College, Deur, satara

2. O3
A gas composed of three atoms of Oxygen.
Bluish gas - harmful to breathe
In 1994, the UN General Assembly proclaimed
16 September the International Day for the
Preservation of the Ozone Layer,
commemorating the date of the signing, in 1987,
of the Montreal Protocol on Substances that
Deplete the Ozone Layer.
Ozone

3. Montreal Protocol
Montreal, Canada
Signed
16 September 1987
Signatories
46
Location
Depositary
Secretary-General of the
United Nations
Ratifiers
197 (all United Nations members

4. Courtesy: BYJU'S
A region of the upper atmosphere, between
roughly 15 and 35 km above Earth’s
surface, contains relatively high
concentrations - O3.
Approximately 90 % of the atmosphere’s
ozone occurs in the stratosphere, the region
extending from 10–18 km to approximately
50 km above Earth’s surface.
In the stratosphere, the temperature of the
atmosphere rises with increasing height, a
phenomenon created by the absorption of
solar radiation by the ozone layer.
The layer effectively blocks almost all solar
radiation of wavelengths less than 290 nm
from reaching Earth’s surface, including
certain types of ultraviolet (UV) & other
forms of radiation.
ozonosphere

5. Natural causes
Sun spots and stratospheric winds.
But it does not cause more than 1-2% of
the ozone layer depletion.
Causes of O3 depletion

6. Causes of O3 depletion
Manmade causes - ODS
Chlorofluorocarbons (CFCs),
hydrochlorofluorocarbons (HCFCs),
methyl, chloride and halons
These are released by solvents, spray aerosols, refrigerators, air-
conditioners, solvents, propellants, and foam-blowing agents

7. Ozone
Hole
Source: Wikipedia
Courtesy: NASA

8. Source: Wikipedia
Courtesy: NASA

9. iMPACT OF O3 DEPELATION
human health
certain types of skin cancers,
eye cataracts and immune
deficiency disorders
animals
skin damage, skin
cancer
CROPS
minimal plant growth, smaller leaf
size, flowering and photosynthesis in
plants, lower quality crops for
humans.

10. Avoid the consumption of gases dangerous to the
ozone layer
Minimize the use of cars. The best transport option is
an urban, bicycle, or walking.
Do not use cleaning products that are harmful to the
environment and to us.
Buy eco-friendly local products.
Banning the use of dangerous nitrous oxide.
Maintain air conditioners, as their malfunctions cause
CFC to escape into the atmosphere.
1.
2.
3.
4.
5.
6.
MEASURES TO PRESERVE O3 LAYER

11. iNTERNATIONAL MEASURE
1987,Implementation of
the Montreal Protocol
MEASURES of O3 depletion
nATIONAL MEASURE
India, as Party to the Montreal Protocol since June
1992,

12. human population projections
Courtesy:
Tim Farage

13. Conclusion

14. References
https://en.wikipedia.org/wiki/Montreal_Protoco
https://en.wikipedia.org/wiki/International_Day_for_the_Preserv
ation_of_the_Ozone_Layer
https://earthobservatory.nasa.gov/images/79198/watching-the-
ozone-hole-before-and-after-the-montreal-protocol
https://en.wikipedia.org/wiki/Ozone_depletion

15. thank you !!!
Namdev V Telore, Ph.D
Raja Shripatrao Bhagwantrao
Mahavidyalaya, Aundh, Dist. Satara,
M.S.
e-mail: nvtelore@gmail.com website:
https://rsbmaundh.org/https://vidwa
n.inflibnet.ac.in/profile/159877