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Kolotar, 4 October 2010. The acute toxic risk deriving from the heavy metals in the red sludge is rather low, as their concentrations are rather low. However, the chronic toxicity threat is high.

The Accident Emergency Warning System (AEWS) of the Danube River Basin is activated whenever there is a risk of transboundary water pollution, or threshold danger levels of certain hazardous substances are exceeded.

Many people consider droughts to be rare, but in fact they are a normal and recurrent feature of the climate. Drought events are regional phenomena, affecting transnational water management. Unfortunately, droughts have a high damage potential: economic losses, ecological damages, and implications on human health.