The Icelandic Volcano, Eyjafjallajokull, started erupting on 14th April 2010. The volcanic ash cloud produced covered much of Northern Europe for several weeks causing extensive disruption to air travel. The UK and European atmospheric communities had many instruments - both airborne and ground-based, remote sensing and in-situ - taking measurements of the ash cloud throughout this period. The dataset comprises of measurements of aerosol and particle layers (upper and lower boundary, height, horizontal extent) and infra-red and visible imagery of the ash cloud.