Do Stellarium's light pollution levels roughly correspond with those at lightpollutionmap.info ?
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Stellarium use the Bortle Scale for light pollution.
It would be interesting to see whether a correlation between the Bortle scale and the scale used at lightpollution.info could be established. If successful, with some additional work Stellarium possibly might be able to optionally fetch from the website light pollution level information corresponding to the currently selected location coordinates, thus realistically simulating the night sky visible from that given location.