What causes an ozone hole
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Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere (see details below). ... CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity.
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The ozone hole has developed because people have polluted the atmosphere with chemicals containing chlorine and bromine.... Once released from CFCs, chlorine (CI) then reacts with ozone (O3) to form CIO and O2. CIO quickly breaks down to release the CI atom which can repeat the process with another 03 molecule.
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