Question

The main gas responsible for ozone depletion is:
1. Carbon dioxide
2. Nitrogen dioxide
3. Methane
4. Chloro fluro carbon

Answer 1

Correct Answer - Option 4 : Chloro fluro carbon

The correct answer is Chloro Fluro carbon.

• The ozone layer is a layer in the earth’s stratosphere that contains high levels of ozone. 
• This layer of ozone absorbs 97 - 99 % of the UV radiation from the sun and protects the earth from UV rays.
• Chemical compounds that cause ozone layer depletion is called (ODSs) Ozone Depleting Substances.
• Chlorofluorocarbons, Carbon tetrachloride, hydrochlorofluorocarbons, methyl chloroform, hydro Bromo fluorocarbons, halons are examples of ODSs.
• When ODSs come into contact with ozone, they destroy it and it is called Ozone layer depletion.

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• On earth, Fauna is also adversely affected by ozone layer depletion.
• 16 September is observed as "World Ozone day".