The New World Atlas of Artificial Sky Brightness
Light pollution in urban centers creates a sky glow that can blot out the stars. The brighter the area in this zoomable map, the harder it is to see stars and constellations in the night sky. In the United States, national parks are often a refuge for darkness; national parks are shown in purple in the map below.
This map is based on data published June 10 by a team of researchers led by Fabio Falchi and including NOAA's Chris Elvidge and CIRES' Kimberly Baugh.
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Download Download kmz data from the Heimholtz Centre in Potsdam, Germany.