Are there any websites which map light pollution levels so I know where to go for decent long exposure night shots? Or general resources for that matter?
2 Answers
I would start at the International Dark Sky Association. They have detailed maps for North America and also a link to the Blue Marble Navigator for the rest of the world. Although a little older, I find these maps of North America more readable.
Your distance from light pollution is very important when capturing any night shots including auroras. I would recommend using the Dark Sky Finder (USA only) and trying to be at a minimum darkness of the blue areas of the map. This means that almost the entire eastern United States is not a great place to photograph auroras! You could still do it, but it just won't be optimal with all of the light pollution. The lights only occur from about 50-400 miles above the earth's surface, so light pollution isn't quite as impactful as star photography, but it still plays a role.
Another option to assess light pollution is the Blue Marble Navigator, which works worldwide.
If you are interested in auroras in particular check out my previous answer here: What tips and advice do you have for photographing the Aurora Borealis?