They created over a third of all the particle pollution in London in 2016.
47 UK towns and cities have broken the WHO's annual limit on air pollution.
'Imagine if more people left the car at home every day.'
'People are continuing to suffer unnecessarily.'
It's set to cost £20 billion a year.
Cleaning products, paints, perfumes could be causing as much air pollution as cars.
'It would inexcusable not to take the strongest action now.'
Government ministers have known about the adverse effects of diesel cars on people’s health for decades, campaigners say