I would like to make the “Exponential Height Fog” and the “Atmospheric Fog” invisible when going into buildings. How I can create a smooth transition between the visibility and the invisiblity?
This is how it looks like. 
Hmm. It works but how variables I have to change?
Its looks like a nuklear area xD
And it din’t turn completely off when I go in to buildings. 
Ok, here is a new version:
Now you can adjust the fo minimum and maximum cap. the minimum has that value of 0.1. You can set it to 0 to completely disbale the fog. Try this and you can see a sudden disable effect. thats why i took 0.1.
Hey, can you provide a picture from the settings of your atmos fog and exp fog? So i can make a better update.
Now it does not look like a nuclear disaster. ^^
But when I go into a building outside, the sun is not so bright outside, but the fog in the building does not disappear.
Here my Settings and Gifs
Thanks 
I’ll see if it works ^^
Yeah, perfect. You can change a lot of variables. My code example is just a short and easy example to show you how you can do that. Of course you can extend that for your needs.