Most of Europe == Not covered by light polution. (and specific areas)
(it's orange outside and it's sodium vapor related)
edit: kind of whish I was at my parent's place. It's a lot less poluted but no go here; nw europe densly populated, we also have the artificial sunrise here 24/7 by means of greenhouses.
> we also have the artificial sunrise here 24/7 by means of greenhouses.
That's a Dutch thing. You can choose between being a great exporter of unripe, tasteless tomatoes, or seeing Aurora Borealis, but you can't have both..
This is what I could see with my camera in the east of the Netherlands, and even with the naked eye I could easily see some red at times: https://imgur.com/a/kloWEOl
I was in middle of nowhere Sweden last week but the number of daylight hours are so high that far north that even in the dead middle of the night the sky is still blue
From the ground I cannot see it (I'm a bit north of london latitude wise so it should be better), and we have nicely combination of areas of greenhouses and petrochemical companies burning off here so it might be far worse than central london unfortunately. I'm not too high up but my view north is quite ok ... and unnatural orangeish and void of any pink.
(it's orange outside and it's sodium vapor related)
edit: kind of whish I was at my parent's place. It's a lot less poluted but no go here; nw europe densly populated, we also have the artificial sunrise here 24/7 by means of greenhouses.