Eyjafjallajökull Study Iceland Ash Did Pose Threat to Planes

Since the eruption of an Icelandic volcano caused havoc with Europe's air transport system just over a year ago, doubts have persisted over how dangerous the ash clouds really were. A new study has concluded that the ash released in the first part of the eruption did, in fact, represent a risk for planes.
A plume of ash rising from a volcano erupting under the Eyjafjallajökull glacier on May 5, 2010.

A plume of ash rising from a volcano erupting under the Eyjafjallajökull glacier on May 5, 2010.

Brynjar Gauti/ AP
dsk -- with wires