Volumetric fog / mist

I am making map where a thick particle mist covers the entire map. How can I prevent those particles from spawning inside houses and such without having to split the mist into several particle systems?

Or is there some other way to get the mist effect outside but not inside?

In Unity, go to Edit Menu → Render Settings → And use the settings there to adjust the global fog. You can change color, density and the distance at which it will render. Hope this helps =)

There’s a volumetric fog asset on the store, but it’s limited to box shapes.