Cavan County Council is warning people about algal blooms.
It is advising that due to prevailing conditions and nutrient enrichment, algal blooms, which appear as a green scum, may appear on lakes throughout the county.
People are being warned to avoid contact with algal blooms as they may cause skin irritation or be toxic if ingested.
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Dogs are particularly sensitive to these blooms, and should be kept away from affected water and shorelines.
