The World Health Organisation yesterday warned people living under the volcanic ash plume to stay indoors if ash starts falling, as it has done in Iceland, Scotland and Norway. The microscopic particles may be dangerous because they can enter the lungs and cause respiratory problems, said a spokesman, and people going outside might want to consider wearing a mask. He added that the WHO doesn't fully understand the health risks associated with the ash cloud and was was trying to learn more about it.

The UK Health Protection Agency said that people may suffer from itchy or irritated eyes, runny nose, sore throat or dry cough. Anyone noticing a dusty haze in the air or the smell of rotten eggs should return indoors. Those with existing respiratory conditions such as chronic bronchitis, emphysema and asthma should have their inhalers or medications with them, it added.