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Hi
If you're using light pollution map info for your SQM readings, then the data you are probably using is from their World Atlas 2015 dataset, yes? If so then it's entirely possible that the light pollution readings have changed over the years, although one would think it unlikely that they'd reduce. The only real way to know is with your own SQM reading, and BTW remember that the SQM readings given are at Zenith, not anywhere down near the horizon or near any light domes, unless of course they're huge.
Best
JA
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