G9-OZONE-llllllllllllLAYER-DEPLETION.pdf

Lesson

1. OZONE
DEPLETION
OZONE
DEPLETION
GUZMAN SHUN LLOYD
UMENGAN PRINCES ANGEL

2. objectives
Explain the chemical composition
and formation of ozone.
Identify human-made chemicals
that contribute to ozone depletion.
Discuss the environmental and
health impacts of ozone layer
depletion.

3. what is ozone layer?
Ozone layer is found in the
stratosphere
A region of the atmosphere from 19 to
48 km above Earth's surface
Ozone concentrations of up to 10
parts per million occur in this layer.
The ozone forms by the action of
sunlight on oxygen
a gas composed of three atoms of
oxygen(O3)

4. what is ozone depletion?

5. ozone
depletion
refers to the thinning of the
ozone layer caused by the
release of certain human-
made chemicals, particularly
chlorofluorocarbons (CFCs)
and halons. These compounds
contribute to ozone depletion,
and are called ozone-
depleting substances (ODS).

6. ozone depleting
substances
ODS THAT RELEASE CHLORINE INCLUDE
CH₃CCL₃
CH₃BR
ODS THAT RELEASE BROMINE INCLUDE
chlorofluorocarbons (CFCs)
hydrochlorofluorocarbons (HCFCs),
carbon tetrachloride,
methyl chloroform.
halons
methyl bromide

7. Global production of CFCs and other ODS
continued to grow rapidly as new uses were
found for these chemicals in refrigeration, fire
suppression, foam insulation, and other
applications.
Aerosols increase chlorine's effectiveness at
destroying ozone.
ODS are very stable and do not dissolve in rain.
Thus, there are no natural processes that remove
the ODS from the lower atmosphere.

9. Skin Cancer (melanoma and
nonmelanoma)
Premature aging of the skin
and other skin problems
Cataracts and other eye
damage
Immune system suppression
Damage to early
developmental stages (fish,
shrimp, crab, amphibians).
Decreased reproductive
capacity.
Impaired larval development.
Potential population
reductions.
Increased UVB alters
terrestrial and aquatic
cycles.
Changes in sources and
sinks of greenhouse and
trace gases.
HUMAN
PLANTS
MARINE
ECOSYSTEMS
BIOGEO-
CHEMICAL
CYCLES
impact of
ozone layer
depletion on:
Altered plant form and
nutrient distribution.
Timing of developmental
phases.
Secondary metabolism.

10. The
Antarctic
Ozone Hole
This is not really a
hole through the
ozone layer, but
rather a large area
of the
stratosphere with
extremely low
amounts of ozone.

11. Solutions and
Mitigation
Strategies
Responsible Appliance Disposal Program
Contact local authorities to properly dispose of refrigeration or air
conditioning equipment.
Sun Safety
See your UV forecast and learn how to protect yourself from UV radiation.
Programs to Address HFCs
Learn about EPA’s work to address HFCs under the AIM Act

12. Solutions and
Mitigation
Strategies
Multilateral Fund (MLF)
Established in 1991.
Supports developing countries.
Activities worth over $3.0 billion.

International Treaties and Cooperation
Vienna Convention-Framework for ozone layer
protection.
Montreal Protocol-Phasing out ozone-depleting
substances (ODS).
Amendments-Kigali Amendment: Phasing down
hydrofluorocarbons (HFCs).
UNEP Ozone Secretariat-Oversees
international agreements.

13. LET'S
WORK
to protect
our planet
and ensure a
sustainable
future for
generations
to come.
TOGETHER
protect
our planet