What Is Light Pollution?
According to the IDA, light pollution is defined as "the inappropriate or excessive use of artificial light." There are four main components of artificial light: skyglow, glare, light trespass, and clutter.
Skyglow
Brightening of the night sky over inhabited areas
Glare
Excessive brightness that causes visual discomfort
Light Trespass
Light falling where it is not intended or needed
Clutter
Bright, confusing, and excessive groupings of light
Research Credits
Katie Joslyn • Class of 2024
State of the Rockies Project
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Last updated: 03/28/2025