Polar stratospheric clouds (PSCs), also called nacreous clouds, form high in the polar stratosphere during winter, typically between 15 and 25 kilometers in altitude. They develop in extremely cold conditions—around −78°C or lower. Unlike regular clouds, PSCs consist of ice crystals and supercooled droplets of nitric acid and water. These clouds are significant in ozone layer depletion, as they provide a surface for chemical reactions that release chlorine and bromine compounds, which break down
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