| The protocol restricts the manufacture and use of human-made, ozone-depleting compounds, such as chlorofluorocarbons and halons. |
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| During the 1980s evidence emerged linking the release of chlorofluorocarbons, halons, and other chlorine-based substances with the gradual destruction of the ozone layer. |
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| The Renew is also free of polyvinyl chloride, asbestos, chlorofluorocarbons and halons. |
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| Last year, as scheduled, production of firefighting chemicals called halons came to an end. |
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| The halons are unreactive in the lower atmosphere, giving them time to float up to the stratosphere, where they release their ozone-destroying bromine. |
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| During World War II, various chloroalkanes were in standard use in military aircraft, although these early halons suffered from excessive toxicity. |
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| Halons have been used for years in many kinds of fire-extinguishing systems. |
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| Halons were the first ozone depleting substance to be phased out in industrialized countries under the Montreal Protocol. |
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