Durham County Council is carrying out felling and pruning of trees which have been found to be dead, diseased or dangerous.
The work is based on the recommendations of an independent health and safety survey commissioned by the council after a small number of trees were found to be diseased or dying, some near public footpaths.
Urgent works have already been carried out to dangerous trees in the interests of public safety. None urgent works will continue over the next six to nine months.
None of the specimens subject of the works are subject to Tree Preservation Orders or within a Conservation Area. Where a cluster of trees is to be felled, replanting will be carried out with native species.
The work is taking place at Greathead Crescent, St Oswald’s Park, Watson Road, Rope Moor Plantation and Great Aycliffe Walk.
Jimmy Bennett, County clean and green manager at the council, said: “This work is being carried out in the interests of health and safety and the good management of these trees.
“Trees will only be felled where they can not be saved and we will be replanting clusters with native species. We will seek to minimise disruption to the general public while these essential works are carried out.”