If you've been outside recently you may have noticed a lot of fog hanging about.
The thick mist has caused widespread travel disruption across Europe, leading to flight cancellations and a series of weather warnings urging drivers to take extra care on roads.
According to BBC weather forecasters:
Fog is, of course, a common occurrence during the autumn... The sort we have been experiencing is known as radiation fog. It tends to form most readily on clear nights with light winds - conditions that are usually associated with high pressure systems, or anticyclones.
Granby, NottinghamshirePic: PA/Wire
Newark, NottinghamshirePics: Getty
Manchester airportPic: Mike Hughes
London from the skyPic: Sarah Wells
Wimbledon, south-west LondonPic: Rex
Abbiategrasso, ItalyPic: Getty
Tottenham, north LondonPic: Rex
Mintraching, GermanyPic: Getty
Rhododendronpark Kromlau, GermanyPic: Getty
At the beginning of October, there was fog in other part of the world too.
Like China...Pic: Getty
And Dubai...Pic: Getty
Tweet us your fog pictures @thei100.