light-pollution

light pollution

noun
1.
unwanted or harmful light, as from bright street lights or neon signs.
2.
Astronomy. artificial illumination of the sky that sets a limit on the faintness of stars that can be observed or photographed.

Origin:
1970–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
light pollution
 
n
the glow from street and domestic lighting that obscures the night sky and hinders the observation of faint stars

Collins English Dictionary - Complete & Unabridged 10th Edition
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