Question

Write the importance of Ozone layer in the atmosphere, write the reason for its depletion.

Hint:

The Montreal Protocol, signed in 1987, is a key international agreement aimed at phasing out the use of ozone-depleting substances, helping to protect the ozone layer.

Answer 1

The ozone layer, located in the stratosphere, plays a crucial role in protecting life on Earth by absorbing the majority of the sun's harmful ultraviolet (UV) radiation. Its importance includes:
1. Protection from UV Radiation: The ozone layer acts as a shield by absorbing harmful UV rays from the Sun. This protects living organisms from the harmful effects of excessive UV radiation, which can lead to skin cancer, cataracts, and other health problems. It also helps in preventing damage to plant life and marine ecosystems.
2. Climate Regulation: The ozone layer also contributes to maintaining the Earth's climate by regulating the amount of solar radiation reaching the Earth's surface. This helps maintain a stable temperature, essential for the survival of many species.
Reason for Ozone Depletion: Ozone depletion refers to the thinning of the ozone layer due to the release of certain chemicals, particularly chlorofluorocarbons (CFCs), halons, and other ozone-depleting substances (ODS). The main reasons for ozone depletion include:
1. Use of Ozone-Depleting Chemicals: The use of CFCs in air conditioning, refrigeration, and aerosol propellants has led to the release of chlorine and bromine compounds into the atmosphere. These compounds break down ozone molecules, leading to thinning of the ozone layer.
2. Industrial and Agricultural Activities: Other chemicals such as halons, carbon tetrachloride, and methyl chloroform, which are released during industrial and agricultural activities, also contribute to ozone layer depletion.