Starting today, owners of older, dirtier cars will be charged an extra £10 if they want to drive into the centre of London. The Mayor, Saddiq Khan, announced the "Toxicity charge" in February as part of a package of measures to clean up the capital’s "filthy air".

The "T-charge" has been introduced today, the start of the autumn half-term, and will be in operation Mondays to Fridays from 7am to 6pm.

Why has the T-charge been introduced?

It's all part of the Mayor's plan to tackle air pollution. Around 9,000 early deaths in London are thought to be caused by long-term exposure to air pollution each year. As a result Mr Khan is investing £875m over the next five years to alleviate the problem.

Other initiatives include the launch of the world's first "Ultra Low Emission Zone", which would mean that all vehicles, except taxis, had to adhere to minimum emission standards. This is subject to consultation but could be in place in central London by 2019.