International Dark-Sky Association - Nonprofit membership-based organisation that aims stop the adverse environmental impact of light pollution and space debris.
Night Sky in the World - Satellite monitoring of nocturnal light pollution around the world, and its impact on stellar visibility. Includes maps and images from the Light Pollution Science and Technology Institute.
Pennsylvannia Outdoor Lighting Council - Goal is to reduce light pollution by educating the public about the safety and nuisance problems of obtrusive and inefficient lighting.
