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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.

What is being done to protect the ozone layer?

Ozone Depleting Substances

chlorofluorocarbons

hydrochlorofluorocarbons

halons

methyl bromide

carbon tetrachloride

hydrobromoflurorocarbons

chlorobromomethane

methyl chloroform

  • Montreal Protocol on Substances that Deplete the Ozone Layer
  • 191 countries
  • reduce and eliminate use and production
  • US "Clean Air Act"
  • end production
  • ensure proper recycling
  • identify safe and effective alternatives
  • require labels
  • used in refridgerators, air conditioners, fire extinguishers, in dry cleaning, in electronic equipment and as agricultural fumigants

However...

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

Effects of a compromised ozone layer:

What else can we do to protect the ozone?

On the Environment

  • Animals and

plant life effected

  • plastic materials

effected

On humans

  • Eye damage
  • Skin damage
  • Supression of the

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.

  • research
  • educate
  • legislate

Let people know that the ozone is important to you

Damage to the Ozone Layer

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.

What is Ozone?

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

Protecting the Ozone Layer

Grace Lovell

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