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These substances have a significant potential to harm the ozone layer for two reasons. The first is that they do not break down in the lower atmosphere — they can remain in the atmosphere for long time periods. The second is that they contain chlorine and/or bromine and thus help the natural reactions that destroy ozone (18).
Source: EUR-Lex (Cellar) · retrieved 2026-09-25 · Text as adopted (Official Journal); later amendments are not incorporated in this text.