Question about light in the distance

Greetings.

I am working on a project that has both indoor and outdoor areas.
Right now the only lighting I am using is the default SunSky.
The interior areas include several long hallways.

The issue I am having is that the light does not seem to fall off in the distance.

The image shows looking down the hall and the end of the hallway should be darker, yet it consistantly grows brighter.

I would appreciate any thoughts on resolving this. Thanks.