Ozone is a poisonous gas made up of molecules consisting of 3 oxygen atoms.
It is denoted by O3.
Most of the ozone exists in the upper atmosphere or the stratosphere ( 12 to 50 km ).
The ozone layer is essential for the existence of life on Earth because : –
- it absorbs most of the harmful UV rays from the sun and it also screens out the harmful radiations.
# PROBLEM OF OZONE LAYER DEPLETION
When the ozone layer gets depleted due to ODS , radiation reaches the Earth’s surface which results in the increase of various diseases like : –
- Skin irritation
- Weakened immune systems
- Damage to ocean ecosystems etc .
The ozone layer is observed mostly over the Antarctica during 1980’s.
WHAT WAS CAUSING OZONE LAYER DEPLETION ?
In the 1970-80’s , Scientists discovered CFC’s broke apart in the atmosphere and released Cl atoms.
This caused the ozone layer depletion which was caused by the human activities.
The same result was observed when : –
Br atoms were released by halons.
ODS = Ozone Depleting Substances
ODS are the substances responsible for the degradation of ozone layer .
- Methyl Bromide
WHY OZONE LAYER DEVELOP MOSTLY OVER ANTARCTICA ?
Strong winds in the stratosphere over Antarctica form an enormous ring of moving air called the polar vortex.
The temperatures inside the Antarctic polar vortex fall so low that water vapor condenses into small icy particles which form Polar Stratospheric Clouds ( PSCs ).
Special reactions that occur in PSC’s combined with relative isolation of PS : –
- Air and
- Sunlight allow Cl and Br reactions to produce the ozone hole.
Some international protocols were considered to reduce the impact on ozone and they were : –
- Montreal Protocol
- Kyoto Protocol
EFFECTS OF OZONE LAYER DEPLETION
Some of the effects are : –
- Skin irritation
- Eye Cataract
- Damage to crops
- Degradation of paints, rubber used in buildings.
- Weakens body’s immune system.
Human activities are responsible for all the environment loss.
We should control our actions in order to protect : –
- Life and
Industries, use of vehicles should be limited.
This is because they emit large amount of gases into the atmosphere.
Control your needs like : –
- We can use bicycles
- We can walk nearby .
To promote sustainable development it is necessary to control our emotions and needs.