Class 4 (4th Engineer) SSEP 📅 Feb 2024

Exam Question

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

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

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

Reference Answer

### (a) Ozone Depletion and its Effects
**1. Concept of Ozone Depletion:**
Ozone (O₃) is a gas that forms 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-B) radiation.
Ozone depletion is the steady thinning of this stratospheric ozone layer. The process is primarily caused by the release of man-made chemicals known as Ozone Depleting Substances (ODS).

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