This is great news, not least as it flies in the face of the Trump vision of a return to fossil fuels. Cities globally are now waking up to the serious health risks and illnesses of air pollution, much of it as a result of diesel and petrol engined cars. 

We need to see a multitude of tools deployed, like diesel bans and congestion charging, but also incentives like these, along with car sharing and improved public transport. Let's hope cities around Europe and the world follow suit.