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Action needs to be taken to reduce the smell around a landfill site or it should be shut down, Wrexham councillors have said.
Hafod near Johnstown has been under additional monitoring for six months after complaints of a "rotten egg" smell from residents.
A new report has shown while there are fluctuating hydrogen sulphide levels at the site – the gas responsible for the smell – they are not enough to cause significant harm.
But one specialist at Public Health Wales said some levels detected in communities nearby may be enough to cause runny eyes and a sore throat.
Site operators Enovert described the data as a "snapshot" and said odour management was an active process.