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30 June 2010, 15:16 | Updated: 30 June 2010, 15:20
A study for the Mayor's office says more than four thousand people in London could be dying early each year due to longterm exposure to pollution.
Bryanston and Dorset Square are the most polluted areas followed by Marylebone High Street and the City of London.
But the report says outer London is projected to have the most early deaths linked to pollution, due to its higher population.
The Campaign for Clean Air in London is calling for more urgent action to address London's air quality.