A “high” air pollution alert has been issued by the Mayor of London today following dense fog.

It’s only the fourth time this year such a warning has been made.

Forecasters at Imperial College London advised Lord Sadiq Khan to trigger the alert.

They say smoke from Bonfire Night and Diwali fireworks “is likely to have contributed” to the situation.

The Deputy Mayor for Environment and Energy, Mete Coban said: “Toxic air is responsible for thousands of premature deaths in London each year, which is why the Mayor has done everything in his power to tackle it, which includes launching the world’s largest clean air zone.

“It is really important we all do our bit to protect those who are most vulnerable as we continue working to build a safer and greener London for all.”