The major source of Cl atoms in the stratosphere is from

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The major source of Cl atoms in the stratosphere is from human-made chlorofluorocarbons (CFCs), which are widely used in refrigerants, solvents, and aerosol propellants. When CFCs reach the stratosphere, they are broken down by UV radiation, releasing chlorine atoms. These chlorine atoms then catalyze the destruction of ozone molecules, leading to the ozone hole. NaCl and HCl can release Cl atoms but in much lower quantities compared to CFCs. Cl₂ is not a substance that exists.

The Major Source of Cl Atoms in the Stratosphere Is