Creating fog in Vray for Maya.

[Intuition]

I noticed the "Use environment volume" slot under Environment in the render settings. Is this where I would create a fog in the distance effect fading out objects the farther they are from the camera?

If not, is there any other way I can create this effect?

I noticed the simplefog shader. Is this usable? Do I appy it to a mesh or the environment volume?

Thanks.