Ozone Depletion
Stratospheric ozone reduction from chlorofluorocarbon (CFC) emissions, causing increased UV radiation at Earth's surface.
Formula
Cl + O₃ → ClO + O₂ (catalytic chain)
Real World
The Antarctic ozone hole, first measured by British scientists at Halley Bay in 1985, showed a 40% seasonal loss directly linked to CFC use in aerosol sprays and refrigerants.
Exam Focus
Always state that chlorine acts as a catalyst — it is not consumed — to gain the mechanism mark in 'explain' questions.
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