The ash cloud rising from Iceland’s Grimsvotn volcano is reducing say experts and the eruption could peter out by the weekend.
Icelandic authorities say it is now only two kilometres high. Initial plumes on Saturday were reaching 20 kilometres.
That could have major implications on the need to close airspace.
Meteorologist Emmanuel Bocrie said: “The plume of the whole ash cloud is slowly descending upon the northern part of Europe, and is in the process of entering Germany, Denmark , a part of Great Britain and not immediately but in the coming days, France.”
So far the ash has forced the temporary closure of Iceland’s airspace and the cancellation of around 500 flights in Europe, half of them in northern Britain.
While stranded passengers have shown stoicism in the face of long delays and cancellations, budget airline Ryanair has accused authorities of exaggerating the danger.
It claims it flew a plane over closed Scottish airports and found the ash cloud was non-existent.