Health campaigners are urging the government to do more to tackle air pollution in the capital as new figures show it is a factor in thousands of deaths.
Clean Air London claims that air pollution is killing more then ten times the number of people who die from road traffic accidents.
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Relatives of those killed in the Hyde Park attack 35 years ago marched in central London to bring an accused bomber to justice.
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The incident led to gridlocked traffic on the A2