(Left ) Rainfall observers network assists with volcanis ash sample. (Right) Volcanic ash in Lerwick on car door.
On Tuesday 24 May a number of cars in Shetland, Thurso and Orkney were reported to have a covering of dust, suspected to be volcanic ash.
SEPA staff used a piece on clean cloth to collect a sample of this dust from a car in Lerwick, Shetland and sent it to SEPA's laboratory in Aberdeen for analysis.
SEPA asked its colleagues at the James Hutton Institute in Aberdeen to put the sample through more detailed Scanning Electron Microscopy (SEM) to try to determine whether this material was volcanic in nature.
Volcanic glass aggregate with concave 'bubble' visible in centre of image.