Little things, but can really add to the immersion!
Have a setting in menu for “realistic” environment factors
Examples:
Lights on baseball fields, tracks, etc. turn off after like 10pm. Also not on when temperature is < 40 F (4.5 C)? Except major football stadiums (USA).
House lights start turning off after 9pm sliding scale factor, later it gets more lights go off.
System will reduce leisure boats when temp < 45 F (7 C), sliding scale to NO leisure boats when temp < 32 F (0 C).
Fall/ winter effects such as ice on smaller lakes if temp < 25F. Also condensation exhaust due to temperature, etc.
I think light pollution is already represented to a degree. The aerosol density and the way the night lights kind of reflect off the clouds make denser areas seem lighter versus darker at night in the rural areas (e.g. KISP on Long Island versus 4B6 Ticonderoga, Upstate New York)
I was more referring to the bloom on the horizon in the distance representing a major city. In reality, when flying into New York City at night from say, the southeast, you will see what looks like a wildfire on the horizon from 200 miles away if its clear.
Definately better airport apron lighting, its so unrealistic at the moment, you can hardly see the terminal buildings and other aircraft are just black silhouettes until you get too close.
Don’t the sunrise and sunset colours vary depending on atmosphere pollution, humidity, altitude, and temperature? Thought I recall that the simulator tracks pollution. Would be great to have a huge variation of sky colour upon sunrise and sunset, instead of the “Mars-like” reddish every morning/night.
Turbulence - most time early morning has more stable air than toward afternoon and at times gets even worse later the day gets especially in areas with cumulus clouds.
Would be great if clouds would reflect landing lights. On real live cockpit videos we can see, when an airplane enters a cloud (night time) the cloud reflects the landing lights . That would be nice to have in fs2020.