AN investigation has been launched into the noxious gases emanating from algae in Christchurch Harbour.

The smell has been reported to local councillors over the summer, with Purewell and Stanpit ward councillor, Ray Nottage asking the leader of the council for details on what action is being taken.

Cllr Nottage said: "As councillor for Purewell and Stanpit I have received many complaints this summer from visitors and residents regarding the concentration of huge amounts of rotting seaweed in the estuary.

"The noxious gases - hydrogen sulphide - emanating as a result have caused considerable concern especially in light of the reports from other coastal areas of the potential detrimental health effects to the public as a result of this pollution.

"Can the leader give any assurances to residents that the matter is of concern and detail any action being taken?"

Leader, Cllr David Flagg, said: "I understand that the odours being experienced by residents are from a macroalgae that proliferates on occasion in areas of the harbour.

"This situation is under review and advice on any potential detrimental health affects has been requested from Public Health England's Centre for Radiation, Chemicals and Environmental Hazards and also the Environment Agency.

"Once this advice is received I will ensure that all members are advised accordingly."

Cllr Nottage added: "Could I request that any further discussions include concerns about the reported leaching of nitrates into the Stour and Avon rivers at the rate of 6,000 tons per year and the relevance to consequences we are experiencing.

"How are we to deal with what I understand is an alien species of weed emanating from Australia, the increasing ‘bloom’ of cabbage weed year on year with special regard to the potentially disastrous affect on the whole bio-diversity of the estuary including the threat to invertebrates and other wildlife."

Earlier this year, a Mudeford resident complained about a "terrible odour" she believed was coming from the Christchurch Treatment Works in Stony Lane.

However, Wessex Water said there were no abnormal issues that would affect odour levels.