The East Greenwich Residents Association has expressed concern about dust blowing along the Thames Path on Saturday 4 March.
The epicentre appeared to be at Tunnel Wharf, between Morden Wharf and downstream Bay Wharf, where work was in progress on that Saturday morning.
This section of path is well-known for its willow trees which are under threat of being felled.
A spokesperson for the nearby upstream Victoria Deep Water Terminal, which once had tunnels to shelter walkers, says that the dust is unlikely to have emanated from its operations.
‘As a result of our recent investment the plant has extensive mitigation measures built in, including for dust suppression.’