Dhaka night view in Bangladesh

Night view in Bangladesh

Light pollution comes in three forms, explains Jeremy White. He’s based in Fort Collins, Colo. There he studies this pollution for the Natural Sounds and Night Skies Division of the U.S. National Park Service. Direct light from a specific source, such as a flashlight or headlight, is called direct glare. Indirect light can be found in sky glow or light domes — the kind of light that lets you know a city is off in the distance. And light that intrudes into areas on the ground or on buildings where it’s not wanted is called light trespass.