Diesels face £10 pollution charge
29 July 2014 Last updated at 22:49 BST
Plans to charge drivers of diesel cars about £10 to drive into central London to tackle high levels of air pollution, are being considered.
The levy would be on top of the current £11.50 congestion charge for driving into the centre of the capital.
London Mayor Boris Johnson wants the new Ultra Low Emission Zone (ULEZ) to be introduced by 2020.
Richard Westcott reports.