A blanket of fog over London on 15 December was causing travel chaos, with London City Airport reporting delays and cancellations. Travellers were advised to check with their airline before arriving at the airport throughout the day.
The Met Office listed visibility as "moderate" in the London are on 15 December morning, due to last until the afternoon. Forecasters have predicted that visibility will improve around 2pm for a couple of hours, before returning to "moderate" from 4pm to 6pm.
London City Airport tweeted: "Due to adverse weather we're experiencing some delays and cancellations, please check with airline before you travel."
Flights from Gatwick and Heathrow are not believed to have been affected. However, a number of flights across Europe are also reported to be facing delays, with Eurocontrol (the European Organisation for the Safety of Air Navigation) citing disruption in Palma, Zurich and Vienna.
While no weather warnings for fog have been issued, the Met Office is warning those travelling by road to remain vigilant due to the low visibility. Drivers are reminded to turn on their fog lights during low visibility periods and keep an eye on their speed as fog is said to give an illusion of moving in slow motion.
A spokesperson for the Met Office said: "Watch out for freezing fog which is made of water droplets that freeze on contact with objects such as the pavement, road, car, etc. It can quickly form a layer of ice."
People began taking to Twitter to post about the fog, including those who were stranded at London City Airport.