How to create high density fog in a certain area ?

Hi guys,
was wondering if anyone of you knows how to make an area with high density fog ? I noticed the regular fog actors are level-wide so i am kinda stuck here figuring out how to just make a certain area filled with fog.

Maybe fog sheets?

https://docs.unrealengine.com/latest/INT/Resources/Showcases/BlueprintExamples/FogSheet/index.html

or

This method for volumetric clouds could be applied for fog https://forums.unrealengine.com/showthread.php?61710-Volumetric-cloud-system-overview