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Volcanic Ash clouds 

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Ash clouds occur where a violent explosive eruption ejects volcanic ash into the atmosphere. Bouyed up by the force of the eruption and the small size of particle the ash(< 2mm) may stay aloft for 10s to 1000s of kilometres from the vent. In some case volcanic ash can circulate the globe. Ash is composed of small shattered fragments of rock and volcanic glass particles. When gas or water vapour expands dramatically within the magma rocks are blown to pieces by the sudden expansion- an eruption.

Eyjafjallajokull ash cloud: Iceland april2010 wikiAshfall clouds can block out the sun, are often accompanied by a strong sulphurous smell and unlike snowfall does not melt away.Main problems are:

Eyjafjallajokull Ashcloud 2010

Eyjafjallajokull Ash cloud  wikiIn spring 2010 Eyjafjallajokull,avolcano in Iceland,began an eruption which would effect all of Europe. On April 14 an eruption under the crater glacier started , the heat from the eruption melted the ice which then entered the veent causing amore explosive eruptionThe resultant ash cloud was blown south wards towards Europe.UK Airspace was closed from 15-23rd April, 4-5 May and 16-17 May.Ash fall extent April 15 2010 Wiki

Air space disruption  18th April 2010 wiki