A charity is warning people with asthma and other lung conditions to carry their medication with them over the next few days as the ash cloud is expected to reach the UK.
The British Lung Foundation said people with such conditions could suffer problems because air quality may be significantly reduced when the could reaches the country.
The ash cloud follows an eruption of the Grimsvotn volcano in Iceland.
However, experts believe the cloud will not cause the problems that came after the Eyjafjallajokull volcano eruption last year, which closed European airspace and delayed flights.
Dr Keith Prowse, of the British Lung Foundation, said: "In light of the latest news that ash from the volcanic eruption in Iceland could reach the UK by Tuesday, we would advise people living with a lung condition in affected areas to carry their medication as a precaution."