Experts have explained why Norfolk is seeing so much fog, as the Met Office issues a yellow weather warning.
Local people have been advised to take caution when driving on the roads, with the warning in place until Tuesday morning.
The warning covers central parts of the county, with coastal areas exempt.
The widespread fog formed overnight into Monday, as temperatures dropped to between 3C and 5C across England and Wales, causing moisture at ground level to condense into water droplets.
Light winds allowed the fog to become denser throughout the night.
"With a large area of high pressure across the UK, conditions are ideal for the formation of dense fog," Elizabeth Rizzini, the lead weather presenter for the BBC said.
"Fog has been particularly dense and widespread on Monday morning because there has also been a lot of fireworks and bonfires over the last few days.
"Tiny smoke particles act as extra cloud condensation nuclei which allows more water vapour being able to turn into droplets."
The heavy fog forced two flights into Norwich Airport to be cancelled this morning.
Patchy fog could also develop outside the warning area in northern parts of the UK, wherever skies remain clear for long enough.
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