TheHouseAlwaysWins
Look, Ma! Two Heads!

I don't really ever remember this happening in the game itself even though it would probably look pretty cool in it.

When you use a BGS game engine to make a game you only get to choose 3 colors for the environment or the game crashes all the time instead only most of the time.
I think you're underestimating how much thought poor Emil had to put into the big twist of FO4's plot...this time, your the father searching for his son! Or the even bigger bombshell: Shaun is really the leader of the big bad Institute! 10/10! Best writing EVER.I can't believe theres is more thought being put into the meaning of the red skyline on the cover of New Vegas in this thread than the entire writing team at Bethesda about the whole of FO4.
Not hard, I put more though into how I pee.I can't believe theres is more thought being put into the meaning of the red skyline on the cover of New Vegas in this thread than the entire writing team at Bethesda about the whole of FO4.
You say that but there are those tricky moments that every man has to face every once and a while.Not hard, I put more though into how I pee.
Fallout New Vegas had a orange tint filter just like Fallout 3 had the green one. By this I imagine that the devs were trying to say that in Fallout New Vegas most outside areas have this red/orange desert dust particles, which in turn means that what @Izak posted is probably the reason:
It's a red/orange dust storm being hit by the New Vegas lights.
This post is the answer to OP's question.It's to symbolise the end of a good IP and the fact that Bethesda is opening up Hell and sucking Fallout in.