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The International Dark-Sky Association (IDA) is the recognized authority on light pollution and is the leading organization combating light pollution worldwide.

Our Vision

The night sky, filled with stars, is celebrated and protected around the world as a shared heritage benefitting all living things.

Our Purpose

To protect the night from light pollution. 

Our Approach

By providing leadership, tools, and resources for individuals, policymakers, and industry, we will reduce light pollution and promote responsible outdoor lighting that is beautiful, healthy, and functional. We will bring the issue of light pollution to diverse communities worldwide with the goal of creating access to information about the destructive impact of over-lighting and the benefits of responsible lighting.

Our Values

In all our words and deeds we are guided by our core values.

  • Passion: We are enthusiastic advocates for the night that benefits all living things and its star-filled sky.
  • Credibility: We base our actions on evidence – where it is lacking, we proceed cautiously and support rigorous inquiry.
  • Relationships: We build enduring relationships to find solutions that benefit everyone.
  • Consensus: We strive for consensus and invite public participation.
  • Inclusion: We believe the night is a shared global heritage – for every person for all time, and light justice requires responsible lighting and access to a night, free of light pollution, for all communities.
  • Nonpartisan: We work to advance public policy without regard to political ideology.
  • Celebration: Our spirit is enriched by the wonders of the night—from the star-studded sky to the flash of a firefly.

Key Terms:

  • Light Pollution: Any adverse effect or impact attributable to artificial light at night.
  • Artificial Light: Light, ranging in wavelength from the ultraviolet to the near-infrared, that is caused, directed, or used by humans for any purpose.


Photo by Vincent Chin on Unsplash