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The O₃ molecules are rather unstable and easily broken up.

This instablity is, what makes ozone at ground level (summer smog) dangerous.

We all know that in the 1970s and 80s scientists noticed a depletion of the ozone layer around the poles due to the presence of chlorofluorocarbons (CFCs), used for aerosoles, fridges and air conditions in the atmosphere.

These CFCs, chemically stable substances, acted as catalysts, breaking up the ozone molecules.

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