The following has worked fairly well for me in the past. Tweak, by all 
means!

#declare NearFogColor = <0.799, 0.799, 0.80>*1.2; //Blueish color
#declare FarFogColor  = <0.90, 0.90, 0.90>; //Light gray horizon color

//Near fog
fog {distance 4000 fog_type 2 fog_offset 25 fog_alt 20 color srgb 
NearFogColor}

//Distant fog
fog {distance 8000 fog_type 2 fog_offset 25 fog_alt 20 color srgb 
FarFogColor-NearFogColor}



-- 
Thomas

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