A man and a dog stand on a hill as storm Celia blows sand from the Sahara desert over Madrid
(Picture: REUTERS/)Madrid residents have been told to stay indoors by Spanish officials after a huge sandstorm from the Sahara dumped dust across the capital.
Spain’s national air quality index have deemed the air in the capital and large parts of the south-east coast to be “extremely unfavourable” – its worst rating.
