Media playback is unsupported on your device

Sahara dust causes sore throats and dirty cars

2 April 2014 Last updated at 12:49 BST

Government health advice has been issued amid warnings that pollution spreading across England will again hit high levels later.

The pollution - a mix of local and European emissions, and dust from the Sahara - has caused a thick layer of grime to form on cars and buildings around the country.

Pallab Ghosh reports.