Atmospheric Perspective at NIGHT
Regardless of whether the landscape you're painting is set during the daytime or at night, the rules of Atmospheric Perspective are the same.
Below are some good examples of Atmospheric Perspective seen in night time scenes.
Notice how as object go further back in space their attributes still change to be:
Lighter in value
Less Contrast
Less Saturated
Cooler in hue
Less detail/visible texture