Light Pollution

What is light pollution?

Light pollution is probably best described as artificial light that is allowed to illuminate, or pollute, areas that are not intended to be lit.

Light pollution consists of several elements:

  • Light trespass - light spilling beyond the boundary of the property on which a light is located, sometimes shining through windows and curtains.
  • Glare - the uncomfortable brightness of a light source when viewed against a darker background.
  • Sky glow - the pink or orange glow we see for miles around towns and cities caused by a scattering of artificial light by airborne dust and water droplets.
ID: 2406, revised 23/03/2023