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Originally Posted by janoskiss
Air quality will greatly affect sky conditions, so the light pollution map does not tell the whole story. Often you drive farther but the skies get no better. Past the 100-120km mark, you need to be lucky to get deeper skies.
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That's a very good point, totally agree, and the benefit of the Alpine area.
I have found in the past that despite being in a dark sky area, lots of dust in the atmosphere creates an airglow of some sort that brightens the sky.