Light Pollution

Light pollution is the presence of unwanted, inappropriate, or excessive artificial lighting. In a descriptive sense, the term light pollution refers to the effects of any poorly implemented lighting, during the day or night. Light pollution can be understood not only as a phenomenon resulting from a specific source or kind of pollution, but also as a contributor to the wider, collective impact of various sources of pollution. Although this type of pollution can exist throughout the day, its effects are magnified during the night with the contrast of darkness. It has been estimated that 83 percent of the world's people live under light-polluted skies and that 23 percent of the world's land area is affected by skyglow. The area affected by artificial illumination continues to increase. A major side-effect of urbanization, light pollution is blamed for compromising health, disrupting ecosystems, and spoiling aesthetic environments.

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It's Time to Fight Light Pollution

Light pollution is disrupting the seasonal rhythms of plants and trees. Nighttime light intensity lengthens pollen season in US cities.

Light pollution can disorient monarch butterflies

Light pollution: Environmental impact, health risks and facts

Light pollution increasing year round for some migrating birds

The moon and stars are a compass for nocturnal animals — but light pollution is leading them astray

Even the sea has light pollution. These new maps show its extent

Visibility Predictions for Near-future Satellite Megaconstellations: Latitudes near 50° Will Experience the Worst Light Pollution

Light pollution makes crickets chirp in the daytime and may disrupt reproductive processes, research finds

Light Pollution Threatens Millennia-old Indigenous Navigation Methods

Challenge for astronomy: Megaconstellations becoming the new light pollution

As SpaceX's Starlink Ramps Up, So Could Light Pollution

To combat the negative effects of light pollution, the Pittsburgh City Council has passed a new Dark Sky Ordinance for all of the city's parks, facilities and streetlights. The Office of Mobility and Infrastructure prepared the ordinance with support from two Carnegie Mellon dark sky experts.

Global Light Pollution Has Increased By Up To 400% In The Last 25 Years And It’s Quickly Getting Worse Say Scientists

Help create a global map of light pollution by gazing at the night sky

Rapid increase in global light pollution

Utah is ready for its ‘dark sky’ moment as tourists leave the crowds behind to see the Milky Way. Utah has 24 locations, from national parks to small towns, where light pollution is at a minimum.

Light Pollution is Making it Harder for Animals to Find Their Way at Night

In West Texas, astronomers worry about growing oilfield light pollution. “For the past, you know, 12 years or so, we have seen a gradually increasing glow that simply wasn’t there in prior years.”

The Streetlights in an Entire County Were Swapped to LEDs. Light Pollution got Worse