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Environmental Chemistry of Ozone Depletion

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Halons

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Similar to CFCs, halons release bromine and chlorine upon breakdown by UV radiation, which then deplete ozone.

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Chlorofluorocarbons (CFCs)

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CFC molecules release chlorine atoms upon UV radiation exposure, which catalytically destroy ozone molecules in the stratosphere.

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Chloroform (CHCl3CHCl_3)

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When broken down by UV radiation, chloroform can release chlorine atoms that contribute to ozone depletion.

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Chlorobenzene (C6H5ClC_6H_5Cl)

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Although less common, chlorobenzene can release chlorine which contributes minimally to stratospheric ozone depletion.

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Hydrobromofluorocarbons (HBFCs)

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HBFCs release bromine upon breakdown, which is highly effective in catalyzing the destruction of the ozone molecules.

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Methyl Chloroform (CH3CCl3CH_3CCl_3)

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UV radiation breaks down methyl chloroform, releasing chlorine atoms which then participate in ozone depletion.

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Hydrochlorofluorocarbons (HCFCs)

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HCFCs release chlorine and sometimes fluorine that can destroy ozone, although they're less stable and less abundant than CFCs.

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Nitrous Oxide (N2ON_2O)

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In the stratosphere, N2ON_2O releases nitric oxide (NO), which then participates in catalytic reactions that decompose ozone molecules.

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Bromochloromethane (CH2BrClCH_2BrCl)

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This chemical releases both bromine and chlorine when decomposed by UV, both contributing to ozone layer depletion.

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Methyl Bromide (CH3BrCH_3Br)

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UV radiation helps break down methyl bromide into bromine atoms, which are highly effective in destroying ozone molecules.

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Carbon Tetrachloride (CCl4CCl_4)

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In the stratosphere, CCl4CCl_4 is photolyzed by UV radiation to release chlorine atoms that catalyze the breakdown of ozone.

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Tetrachloroethylene (C2Cl4C_2Cl_4)

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Also known as perchloroethylene, this chemical releases chlorine when degraded by UV light, contributing to the ozone depletion process.

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