Question

ozone depletion is caused by

Answer 1

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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Answer 2

Ozone depletion is cause mainly by CFCs and other halogens (chlorine and bromine) that break down the Ozone molecules allowing UV rays to enter into the atmosphere of Earth causing a number of problems relating to cancer etc.