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June 17, 2026Environment InternationalOpen Access

Global trends in population exposure to outdoor artificial light at night and future projections

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Authors

WGWei GuoChina University of Mining and TechnologyJLJinke LiuShandong UniversityCKChristopher C. M. KybaGFZ Helmholtz Centre for Geosciences

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Overview

Global trends show increasing exposure to outdoor artificial light at night, indicating potential health risks as urban areas grow.

Key Points

  • To examine trends in population exposure to outdoor artificial light at night and project future impacts based on migration and population growth.
  • Merged two satellite datasets to create a unified time series of outdoor artificial light exposure.
  • Analyzed population changes in relation to light emissions using Shared Socioeconomic Pathways (SSPs).
  • Population exposure to artificial light at night increased from 4.3 billion in 2000 to 6.3 billion in 2020.
  • 88% of the increase in exposure occurred in areas with medium to high light emissions, mainly in urban regions.
  • By 2050, nearly 70% of growth in population exposure to artificial light will occur in medium to high light emission areas.

Cite This Study

Guo et al. (2026) studied this question.

synapsesocial.com/papers/6a3239f6d50b63ecad205394https://doi.org/10.1016/j.envint.2026.110371
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