Not quite thw same as last year's which disrupted air traffic though:-

"Pall Einarsson, a geophysicist at the University of Iceland, said the 2010 eruption was a rare event.

"The ash in Eyjafjallajokull was persistent or unremitting and fine-grained," he said.

"The ash in Grimsvotn is more coarse and not as likely to cause danger as it falls to the ground faster and doesn't stay as long in the air as in the Eyjafjallajokull eruption.""