1. NEWSLETTER :THE OZONE
Ozone layer
The ozone layer It is mainly lo- and Henri
is a layer of cated in the Buisson.
Earth’s atmos- lower portion of
Its properties
phere which the strato-
were explored
contains sphere from 20
in detail by the
high concentra- to 30 kilometers
British meteor-
tions of ozone above Earth.
ologist G.M.B
(O3). This layer The ozone layer
Dobson, who
absorbs was discovered
developed
the sun's ultra- in 1913 by the
a simple
violet light, French physi-
spectrophotom
which damages cists
eter
life on Earth. Charles Fairy
that could be and 1958 sta- continue to
used to meas- tions, Dobson operate to this
ure strato- established a day.
spheric ozone worldwide
from the network of
ground. Be- ozone moni-
tween 1928 toring which

2. Page 2 THE OZONE
Ultraviolet light and ozone
The ozone (UV) categories
is radiation based on
important coming its
to life from the wavelengt
because it sun. UV h:
absorbs radiation UV-A (400
harmful is divided –315 nm),
ultraviolet into three UV-B (315
Ultraviolet light and ozone
UV-B cause of in
radiation sunburn , problems
can be it also such as
harmful to causes skin
the skin genetic cancer.
and is the damage,
main resulting
Ultraviolet light and ozone
The ozone with a atmosphere
layer is wavelength is 350
very of 290 nm. million
effective at the times
examine UV intensity at stronger
-B; for the top of than at the
radiation the Earth`s

3. THE OZONE page3
Ozone depletion
The ozone nitrous atomic
layer can oxide bromine
be (N2O), (Br). While
depleted hydroxyl there are
by CFCs, (OH), natural
nitric atomic sources
oxide chlorine for all of
(NO), (Cl), and these
and quantities (CFCs)
bromine of man- and
have made bromofluo
increased organ rocarbons
markedly halogen .
in recent compoun These
years due ds, compoun
to the especially ds rise to
release of chlorofluo the
large rocarbons
.These breaks ultraviolet
compoun down them radiation.
ds rise to into Thus,
the molecules dangerou
stratosph These s
ere, where molecules ultraviolet
the become -B
radiation unable to radiation
absorb

4. THE OZONE page4
Fixing the problem
In 1979, many countries, including the U.S., banned
CFCs from being made or used. This was a big step
toward fixing the problem. Today, no spray cans
contain CFCs. Other chemicals are gradually
replacing the CFCs in air conditioners.
But the CFCs already in the atmosphere can take up
to 50 years to reach the stratosphere. Once there,
they hang around in the stratosphere for many
years, doing damage.
Also, the products that still contain CFCs need to be
treated with care. One example of this is a car air
conditioner. When the air conditioner breaks, or the
car is taken to a junkyard, the CFCs need to be
carefully taken out and recycled or stored so that
they don't leak into the air.
Teamwork
Editor: Afaf Alkhalil Resources
Designer :Batool Ab-
deen http://
Publisher :Alia www.izotope.com/
Dweko& Marwa Attar products/audio/
Alkods High School ozone/
Grade: second sec-
ondary scientific
Supervisor:Mrs. http://
Tonia Bitar www.ozone.org
toniabi-
tar@gmail.com