Fig. 3.

Light pollution in countries of the G20 group, ranked by the percentage of polluted area based on the three most polluted levels (yellow, red, and white). Color ranges indicate the level of light pollution in µcd/m². The average percentages of light-polluted areas of the European Union and the world are added as benchmarks. Reprint from Falchi et al. (2016) with permission from the American Association for the Advancement of Science (AAAS) under a Creative Commons Attribution Noncommercial License 4.0 (CC BY-NC)