Fog Above?

I really need fog in my game for making good atmosphere, but when I put fog on in the input menu it dosent have fog above me which I also need because I dont have a good skybox can anyone help me?

As far as I know, fog is made by the graphic ship. When a mesh is rendered, the pixel color is altered by the fog color and the distance from the camera . If you don't have a skybox, nothing is renderer in the empty spaces and you can't have fog.You could try huge static particles, with and additive shader. Not sur of the quality of the result ...