Light distributed in outdoor areas where light is not desired. Light pollution is typically caused by outdoor lighting fixtures which may emit a substantial amount of light in an upward direction. This creates a "haze" of light in the atmosphere that cannot be efficiently utilized.
environmental pollution consisting of harmful or annoying light.
The illumination of the night sky caused by artificial light sources on the ground (streetlights, billboards, etc.). Both the light and the loss of contrast make it difficult to find fainter stars and nebulae. This is becoming a bigger problem for both amateur and professional astronomers.
Excess "waste" light given off by outside sources (or sources visible from the outside) at night.
Illumination of the night sky by electric lights, as in an urban area, that interferes with astronomical observation.
Wasted light from city and outdoor lights that makes it hard to see the stars at night.
man-made light drowning out the light of the stars. This is most notable near a large city
Light that is directed to areas where it is not needed, and thereby interferes with some visual act. Light pollution directed or reflected into the sky creates a "dome" of wasted light and makes it difficult to see stars above cities.
The emission of stray light or glare from lighting fixtures in manners that counter the purpose of the light (which is to light what is below).
The brightening of the night sky due to artificial light. Light pollution makes it impossible to view many dim objects that can only be seen in a very dark sky.
Any negative or adverse effect caused as a result of unnaturally occurring light in the outdoor environment (i.e., skyglow, visible glare, light trespass, overlighting).
light, typically from artificial sources, that reaches the night sky, obscuring the view of faint astronomical objects
The degradation of the night sky caused by the combined glow of artificial light, particularly light which is spilled upwards due to poor design. In urban locations light pollution can reduce the limiting magnitude by two or more full magnitudes, reducing the number of stars visible by a factor of 10 and completely obscuring diffuse light such as that cast by our own galaxy, the Milky Way.
Stray light that escapes off site and affects nocturnal ecosystems. Light pollution can also cause glare, compromise astronomical research and is an inefficient use of energy.
Any adverse effect of man-made light. Often used to denote urban sky glow.
The illumination of the night sky by waste light from cities and outdoor lighting, which prevents the observation of faint objects.
Any adverse effect of manmade light. Often used to denote urban sky glow. "The wasted light that goes up into the sky."
a glow in the night sky or around an observing site caused by artificial light.
Light pollution is the light that come from cities and make astronomical observing difficult.
Light pollution is excess or obtrusive light created by humans. Among other effects, it can cause adverse health effects, obscures stars to city dwellers, interferes with astronomical observatories, wastes energy and disrupts ecosystems. Light pollution can be construed to have two main branches: (a) annoying light that intrudes on an otherwise natural or low light setting and (b) excessive light, generally indoors, that leads to worker discomfort and adverse health effects.