Here's how I would do it. These are spheres with the volume texture "heavy pollution" preset. The one on the left is a squashed sphere with "object space" mapping. The one on the right is a stretched sphere with "world space" mapping. In both I lowered the ambience slider to 10. You can play with the color to get a closer match to your ground color. I threw this together for you. I call it, "Watch where you point that thing!" :^)

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy