Fog

I don't want to stress the issue too much, but ... ;-)
at first I had to think about "FOG", what actually is it?
Look up: http://en.wikipedia.org/wiki/Fog
So fog is a type of stratus cloud - things getting complicated!
And then there are haze (dry particles!) and mist
http://en.wikipedia.org/wiki/Haze
http://en.wikipedia.org/wiki/Mist
Now we know, it's fog if the visibility is one kilometer or less!
So lots of the pictures here show scenes in the mist.
I withdraw mine and need to find a foggy one.

Absolutely true. I don't even start voting, it is too overwhelming.
Unfair is the right word.