why my scene is orange?

It looks as if everything beyond a certain point is getting different post-processing or scene settings compared to the center of the city. Do you have any Volumes in your scene that just need to have their volume increased to contain the whole city, or perhaps set to Global? Perhaps you have a reflection probe in this spot which is adding different lighting? Perhaps it's just some light you added near here that you've forgotten about?

Anyway, I'd recommend just turning off everything in your scene one by one until you find the game object that's causing the coloring.

 

It's likely the kelvin temperature of your directional light.