Foggy day in Croydon: Lloyd Park has been blanketed in thick fog each morning since the weekend
Croydon is under a toxic fog warning today, as high levels of air pollution have built up after days of light winds.
A high alert for air pollution was issued across London following advice from forecasters at Imperial College. Vulnerable residents are being urged to take particular care.
Separately, the Met Office has issued a “yellow” fog alert for large parts of England and Wales, with visibility expected to fall below 100metres in some areas overnight. Fog was dense enough last night to cause flight cancellations from Heathrow and City airports.
Forecasters say persistent high pressure, light winds and clear skies had created ideal conditions for fog, while very light winds allowed pollution to accumulate over the weekend. Smoke from Bonfire Night and Diwali fireworks, as well as wood burning, are thought to have contributed.
The air pollution alert was issued by London Mayor Lord Khan’s office at City Hall. “High levels of particle pollution are forecast for Tuesday after dense fog and very light winds allowed pollution to build up over the weekend and linger into Monday morning.”
It is the fourth high air pollution alert issued in London in 2026.
The Mayor is encouraging Londoners to help by avoiding unnecessary car journeys and refraining from burning wood or garden waste.
Protect the vulnerable: Mete Coban, London’s deputy mayor for environment and energy
Information has also been shared with GPs and emergency departments across the capital to help them support vulnerable patients.
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.”
Boroughs in central London, plus others including Merton and Bexley, have been given the highest rating for air pollution, at 10. Croydon has been rated at 8.
According to the Met Office, conditions should begin to improve later this morning as the fog gradually clears. One more night and morning of fog is expected. Colder, frosty weather is forecast for later in the week.
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