Heathrow Airport has announced its flight schedule tomorrow will be reduced by 10%, the equivalent to 130 flights.
It said the decision was taken to minimise expected disruption caused by low visibility, which forecasts show is highly probable.
Details of which flights will be cancelled will be announced by airlines when they have finalised their schedules.
Passengers due to fly were urged to check the status of their flight with their airline before travelling to the airport.
More top news
The Salisbury nerve agent attack has heightened tensions between Russia and the West. What is it like to be caught in the middle of the two?
The former national team boss was accused of intimidating a female official with a pole following the Lionesses' semi-final Euros defeat.
Cloudy at first in the south, with patchy rain slowly clearing and turning brighter.