The Arctic stratosphere is normally too cold to allow formation of the clouds that help activate ozone-destroying chlorine.

Name: The Arctic stratosphere is normally too cold to allow formation of the clouds that help activate ozone-destroying chlorine.
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The Arctic stratosphere can indeed become cold enough to allow the formation of polar stratospheric clouds (PSCs), which play a crucial role in the chemical reactions that activate chlorine compounds, leading to ozone depletion.

The Arctic Stratosphere Is Normally Too Cold to Allow Formation