London has been issued with a ‘toxic’ air pollution alert as a result of thick fog and fireworks.
Mayor of London Sadiq Khan triggered the warning after forecasters predicted high levels of particle pollution, which can affect people’s health.
Dense fog and very light winds over the weekend allowed pollution to build up and linger into Monday morning.
Smoke from Bonfire Night and Diwali fireworks, as well as wood burning, is also thought to have contributed to the poor air quality.
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.’
The warning is the fourth high air pollution alert issued in London this year.
City Hall is particularly urging vulnerable people to look after themselves, while asking all Londoners to help reduce pollution where they can.
People are being encouraged to walk, cycle or use public transport instead of driving, and to avoid busy roads where possible.
Those who need to use a car are being asked to consider sharing journeys, switch off their engines when stationary and keep their vehicles well maintained.
Residents are also being urged not to burn garden waste, and to avoid unnecessary use of wood burners and open fires.
Latest London news
Additional information has been sent to GPs and hospital emergency departments across London to help them support vulnerable patients.
Air pollution warnings are shared with schools and borough councils, as well as displayed on public information screens, including bus stop countdown signs and the Underground.