gatuljus

Gatuljus is a term primarily used in Sweden to describe the phenomenon of streetlights or other artificial outdoor lighting creating a noticeable glow in the night sky. This pervasive illumination can obscure the visibility of stars and other celestial objects. The intensity of gatuljus can vary depending on the type of lighting, its directionality, and the presence of atmospheric conditions such as fog or humidity.

The impact of gatuljus extends beyond astronomical observation. It is considered a form of light pollution, which can disrupt the natural behavior of nocturnal animals and affect human circadian rhythms. Efforts to mitigate gatuljus often involve using shielded light fixtures that direct light downwards, reducing upward spill, and employing lighting technologies that are less intense or more targeted. In urban and suburban areas, gatuljus is a common environmental concern for those interested in preserving dark skies.

The term is a compound word in Swedish, with "gata" meaning street and "ljus" meaning light. Therefore, "gatuljus" literally translates to "street light." While the primary association is with streetlights, it can also encompass other forms of public or private outdoor lighting that contribute to skyglow. Awareness of gatuljus has grown in recent years as part of a broader discussion about the environmental and aesthetic consequences of artificial lighting at night.