in your file atmoshpere.hlsl
DCS World\Bazar\shaders\deferred.
search for float3 inscatterColor = GetSkyRadianceToPoint(cameraPos, cameraPos + v*distance, 0.0/*shadow*/, gSunDir, transmittance);
and add line
return color*transmittance + inscatterColor * gAtmIntensity * 0.5; //Taz1004 Haze. 1 is default, 0 is no haze.