Some people might know this already,but some might not,so here i am to explain.
It's real easy to do,so sit down and read those steps:
? Enable Distance Clipping and Enable Fog (Obvious)
? Open the Lighting Tool and edit the colors.
NOTE:It won't work immediatly after you edit!
? As soon as you're done editing,Swap the time of day to any other one and then swap back to the one you were using before,as shown in the example below.
? Enjoy!