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Observational data reveals oxygen depletion in urban ponds due to road de-icing salts, highlighting ecological risks.
This study presents 2 years of high-resolution data from two urban freshwater ponds in Esbjerg, Denmark, revealing recurrent wintertime dissolved oxygen (DO) depletion linked to elevated electrical conductivity (EC) from road de-icing salt runoff. DO levels dropped rapidly during EC spikes, often reaching hypoxic conditions, and recovered as EC returns to baseline values. The phenomenon, not yet described in existing literature, highlights the ecological sensitivity of urban freshwater systems to saline runoff. As we do not have the means, further research is needed to elucidate the underlying mechanisms.
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Podlech et al. (2026) studied this question.
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