Media playback is unsupported on your device

Air pollution: How polluted is central London?

3 April 2014 Last updated at 10:06 BST

Andrew Grieve, who is the senior air quality analyst at King's College, London, talks to Carol Kirkwood about pollution levels in the city.

High levels of air pollution will continue to affect parts of the UK on Thursday, experts have warned.

Environment department Defra said parts of eastern and north-west England, the Midlands, north Wales and south-west Scotland would be the worst-hit.

It said London and the South East had reached the maximum level 10 - meaning very high - on Thursday morning.

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.