Class 4 (4th Engineer) SSEP 📅 Oct 2023

Exam Question

(i) What is ozone depletion and what are it's effects? (5)

(ii) Name the gases which have ozone depleting potential and how ODP is classified. (5)

(iii) What actions are now in place to control the usage or accidental release of such gases. What recordkeeping is essential? (10)

Reference Answer

### (i) Ozone Depletion and its Effects
**1. Concept of Ozone Depletion**
Ozone (O₃) is a molecule forming a protective layer in the Earth's stratosphere, approximately 15 to 30 kilometers above the surface. This layer is crucial for life as it absorbs the majority of the sun's harmful ultraviolet (UV) radiation and plays a significant role in regulating the planet's climate.
Ozone depletion is the process of thinning and breakdown of this stratospheric ozone layer, primarily caused by the release of anthropogenic pollutants, specifically Ozone Depleting Substances (ODS).

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