skyglow

Skyglow is a form of light pollution, defined as unwanted or excessive artificial light. It is considered pollution because it disperses energy that disrupts the environment. The collective glow from urban and suburban lighting brightens the night sky, making stars and celestial objects difficult to see. This artificial light can also interfere with human and animal circadian rhythms, affecting sleep patterns and navigation for nocturnal animals like birds and insects.12

While natural phenomena like airglow and twilight glow also illuminate the atmosphere, skyglow is specifically caused by human-made light sources. Reducing skyglow can involve turning off unnecessary lights, using shielded fixtures to direct light downwards, and minimizing outdoor lighting. Controlling light pollution also helps conserve energy and reduce air pollution associated with electricity generation.3421