Polar Stratosphere explores the fascinating world of polar stratospheric clouds (PSCs) and their profound impact on Earth's atmosphere. These icy formations, glowing ethereally in the polar skies, play a critical role in ozone depletion. The book examines the unique meteorological conditions, such as the polar vortex, that allow PSCs to form in the extreme cold of the stratosphere. It then details the chemical reactions occurring on their surfaces and what this means for the ozone layer. The book highlights how PSCs exacerbate ozone depletion due to anthropogenic pollutants, despite being a natural phenomenon. It clarifies the distinction between Type I and Type II PSCs based on their composition, explains how these clouds facilitate the conversion of chlorine and bromine into reactive forms, and describes the processes that contribute to the Antarctic ozone hole and Arctic ozone depletion. Using satellite observations and in-situ measurements, this book offers a process-oriented view of atmospheric chemistry, stratospheric meteorology, and climate science. Polar Stratosphere progresses from introducing fundamental concepts to detailing PSC formation and their chemical impacts, culminating in a discussion of their role in ozone depletion. This approach provides a deeper understanding of the intricate interactions within the polar stratosphere, making it a valuable resource for anyone interested in Earth sciences and environmental issues.