I want to create realistic Atmosphere.I was try apply on Sky sphere.That was not realistic.I was try so much variations and but I didn’t create what he wanted.

Hi! What are you trying to achieve? You can set a lot of things on that skylight!! …or you can use any hdri so you can have exactly what you want… There are 2 different kind of fogs… now with volumetric lighting option… you can have “god rays”… and you can tune a lot with postprocess!!