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When these substances
reach the stratosphere and
are exposed to ultra violet lights,
they break up into elemental chlorine and bromine that repeatedly catalyze ozone destructions, upsetting the natural balance.
These chemicals can reside in the atmosphere for decades before breaking down.
chlorofluorocarbons
hydrochlorofluorocarbons
halons
methyl bromide
carbon tetrachloride
hydrobromoflurorocarbons
chlorobromomethane
methyl chloroform
Because there are already ozone-destroying chemicals in the stratosphere and some ODS have not yet been phased out, the EPA estimates it will be 60 years before current holes in the ozone layer heal
*Phasing out ODS is sometimes difficult because replacement substances
have not yet been found
On the Environment
plant life effected
effected
On humans
Immune System
Scientists have predicted that if we had done nothing to
protect the ozone layer, by the year 2065 the global
ozone layer would be depleted by 67% and UV
radiation at earth's surface
would have doubled.
Let people know that the ozone is important to you
In 1980 Ozone thinning was discovered over Antarctica
On September 24th, 2006, the largest ozone hole on record was measured at 11.4 million square miles.
Ozone is a gas naturally produced and destroyed by sunlight-driven chemical reactions in the stratosphere. It’s made when oxygen molecules (O2) absorb ultraviolet light and split into individual atoms (O) which join with other O2 molecules to create ozone (O3). Ozone is destroyed when molecules containing nitrogen, hydrogen, chlorine or bromine catalyze reactions that pair single O atoms with ozone to make two molecules of O2. This is a natural process that ensures a natural balance of ozone.
Ozone in the statosphere is a layer 10-30 miles above the earth that protects the earth from exposure to ultra-violet radiation