London’s toxic air is a silent killer and is now a public health emergency. More than 9,000 Londoners die prematurely every year as a result of long-term exposure to air pollution. Research shows 438 schools in the capital are in areas which exceed legal pollution levels, and that there are children growing up in inner London whose lungs are up to 10 per cent smaller than their peers.

Enough is enough. We have a responsibility to take urgent action to protect the health of all Londoners. That’s why today I’ve announced the latest action I am taking - the introduction of a new toxicity charge – a T-charge – on the most polluting vehicles from 23 October this year.

Diesel and petrol vehicles that do not meet the Euro 4 emission standard – typically registered before 2006 – will have to pay an extra daily £10 charge to come into central London. This means that those driving into the Congestion Charge zone between 7am and 6pm on weekdays, in one of these polluting vehicles, will have to pay £21.50 in total. To help drivers, I am also launching a free-to-use online vehicle checker on the Transport for London website, which will tell people whether their vehicle will be affected by the new T-Charge.

Sadiq Khan calls air pollution in London a killer

Today is the 14th anniversary of the Congestion Charge and, much like its introduction, the new T-Charge is desperately needed to change behaviour and ensure we rid our streets of vehicles whose fumes are doing the most harm to Londoners. But we have to face the reality that if we are going to come close to tackling air pollution in London, we have to tackle the problem of dirty diesels too.

That’s why, in addition to the T-charge, I will be consulting Londoners on introducing a central London Ultra Low Emission Zone (ULEZ) in 2019, as well as expanding the ULEZ up to the North/South Circular for cars and vans, and London-wide for buses, coaches and lorries. When introduced, these additional measures would impose an even stronger ‘Euro 6’ emission standard for diesel vehicles, meaning diesel cars could not be more than four years old in 2019 without incurring a charge.

I have also doubled funding on tackling air pollution to £875million over the next five years.

Of course, I expect Transport for London to lead by example, so I’m transforming London’s bus fleet, putting a stop to procuring diesel double-deck buses from 2018 and switching to cleaner hybrid or zero-emission buses instead. Combined, all these measures will help reduce the number of the most polluting vehicles on our streets, including the dirtiest diesels, long before other world cities.

As Mayor, I will continue to do everything in my power to address and tackle this public health emergency, but it’s not something I can do alone.

We also need the Government to step up and make a real difference in helping to improve the health of Londoners and people across the country. This means introducing a national diesel scrappage fund - like the one I recently proposed, which would be the most cost-effective solution to delivering major emission reductions at the same time as helping the thousands of motorists who were wrongly incentivised into buying dirty diesel cars in the first place.