The "end of the world" feel in the western France region was all down to Hurricane Ophelia which is currently battering Ireland albeit as a fierce storm rather than a hurricane.
The tropical storm, which passed the Brittany coast on its way north, brought with it particles of sand from the Sahara desert and the smell of the huge forest fires that have ravished parts of Portugal and Spain.
Nevertheless many worried residents reportedly inundated Brittany's weather service with worried queries about the reason for the yellow sky.
"Are we in Brittany or Mordor," asked one person on Twitter.
Here's a look at some of the more eerie pics.
C’est la polution qui rend le ciel jaune comme ça ? C’est la première fois que je vois ça, j’ai l’impression d’avoir un filtre sépia pic.twitter.com/0x40I4DeSE— Alexandre Calvez (@alexandrecalvez) October 16, 2017
Ciel jaune et ambiance un peu apocalyptique à Rennes ce midi pic.twitter.com/ArY8QOkVmJ— Jeanne (@Jeannecolleni) October 16, 2017