The eruption of the Grimsvotn volcano in Iceland is huge, but it is not expected to cause the kind of disruption we saw last year when Eyjafjallajokull blew its top.
The Eyjafjallajokull eruption, in April 2010, caused the largest closure of European airspace since World War II, with losses estimated at between 1.5bn and 2.5bn euros (£1.3-2.2bn).
Experts say the material produced this time is likely to be in the form of larger grains that will fall out of the atmosphere much faster.