Health Protection Scotland said the particles discovered in the Shetland Islands would not be harmful and that the sulphurous smell was a result of the sulphur dioxide from the eruption.
“It is important to stress that the concentration of particles which does reach ground level is likely to be low and should not cause serious harm,” said a spokesman.
“If people are outside and notice symptoms such as itchy or irritated eyes, runny nose, sore throat or dry cough, or if they notice a dusty haze in the air or can smell sulphur, rotten eggs, or a strong acidic smell, they may wish to limit their activities outdoors or return indoors.
“Those with existing respiratory conditions such as chronic bronchitis, emphysema and asthma may notice these effects more than others and should ensure they have any inhalers or other medications with them.
“Any such health effects are likely to be short term.”
