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Ideally you want the driest air you can find for maximum transparency which is why deserts are good. When I went to Lyndhurst in 2002 for the eclipse the sky was very dissapointing however due to airborn dust.
Best sky I ever saw was Mt Kaputar in 1984. M33 galaxy easy naked eye and the Horsehead was visible in a 6" F4 . Later visits weren't so good . Transparency is a fickle thing. I'd love to go to Kaputar again to compare.
I think the solar cycle has something to do with it too.
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