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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Example sentences
Shielding would protect the night sky from light pollution and direct light
  downward as to not produce glare.
There's no light pollution, so the sky is bright with stars.
The problem is that the bulk of the film's evidence for the awfulness of light
  pollution is emotive.
And that light pollution could be messing with our circadian rhythms, which
  control not only sleep, but metabolism.
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