The Volcanic dust and ash cloud currently drifting over western Europe from Iceland is unlikely to cause any acute health risk or exacerbate allergies and asthma in the United Kingdom. Volcanic ash contains fine grains that may irritate the airways, as well as associated sulphur gas, but the amount that falls to earth and reaches ambient air is likely to be very small. Scientists believe it will be equivalent to Sahara desert sand particles that are regularly drawn up into the atmosphere and then sprinkled down over Britain. Allergy and allergic asthma sufferers should continue to use their preventer and reliever inhalers as usual and see their GP if they have any health concerns.
Reference: Skynews.com