About Light Pollution

What Is Light Pollution?

Light pollution refers to excessive, unshielded, or misdirected artificial light at night. Common sources include streetlights, illuminated buildings, parking lots, and coastal development. Unlike other forms of pollution, light pollution is entirely preventable and reversible.

Types of Light Pollution

• Skyglow: Brightening of the night sky that obscures stars

• Glare: Intense brightness that reduces visibility and safety

• Light trespass: Light spilling into unintended areas

• Clutter: Overconcentration of bright lights

Why It Matters

Poor lighting design wastes energy, disrupts ecosystems, interferes with human circadian rhythms, and blocks access to scientific and cultural connections to the night sky. Responsible lighting can reduce harm without compromising safety.