The algae, which first appeared along Callala Beach late last year, was attributed to natural processes and labelled "awesome" by one of the country's leading algae and seaweed experts, despite the inescapable odour created by the green carpet.

Forced to live with the algae daily, Callala Bay resident Kevin Somerville had a less positive view.

"The stench is mind boggling," he said.

Mr Somerville said he was certain gas released by the rotting algae was responsible for cases of respiratory and other illnesses in the area.

Shoalhaven City Council said monitoring of the atmosphere around Callala Bay had shown gas levels well below dangerous concentrations.

The council said it had been advised by NSW Health that decomposing algae in an open environment "generally" did not pose a health risk.

Mr Somerville disputed the council's claims and called for an independent scientific inquiry.

"We want independent scientific advice from actual scientists," he said.

He said the concerns of residents were not being taken seriously.

"If this were Bondi Beach, this would have been cleaned up three months ago," Mr Somerville said.