10/22/2026
WHAT DO YOU KNOW ABOUT LIGHT POLLUTION?
Light pollution is excessive, intrusive, or poorly aimed artificial light at night that disrupts the natural darkness of our world. Lighting up the night irresponsibly harms our own health and that of local wildlife.
The 4 main types of light pollution are skyglow, glare, light trespass, and clutter. Sky glow is the dome of brightness on the horizon that obscures our view of the night sky. Glare is light that enters our eyes at a shallow angle. Light trespass is light from one property falling onto someone else’s property. Clutter is excessive, confusing, or distracting groupings of artificial light.
Light pollution is increasing by more than 10% each year. See what it looks like where you live: https://cires.colorado.edu/Artificial-light . “The night sky and its stars are a silent, eternal invitation to wonder, to dream, and to remember how vast we truly are; all we have to do is look up and accept." With 80% of the world’s population living under increasingly light-polluted skies, our view of the wondrous universe is getting dimmer.
This is one of a series of posts based on the research of Emily Mirkin, a junior at The Masters School, and Mira Williams Ameen, a sophomore at DFHS. Watch for more in the coming weeks.
For a deeper dive, visit http://www.darksky.org