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Light pollution
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=== Sky glow === [[Skyglow|Sky glow]] is the bright haze above cities that is produced from excessive artificial lighting at night.<ref name="Chepesiuk-2009" /> This type of light pollution is created from artificial light reflecting in the sky and bouncing around the different types of particles that reside in the atmosphere<ref>{{Cite journal |last1=Kaushik |first1=Komal |last2=Nair |first2=Soumya |last3=Ahamad |first3=Arif |date=September 2022 |title=Studying light pollution as an emerging environmental concern in India |url=http://dx.doi.org/10.1016/j.jum.2022.05.012 |journal=Journal of Urban Management |volume=11 |issue=3 |pages=392–405 |doi=10.1016/j.jum.2022.05.012 |issn=2226-5856 |hdl-access=free |hdl=10419/271475}}</ref> The effect of sky glow can be harmful in [[astronomy]] and on the health of many organisms. It worsens the visibility of the stars, the [[Milky Way]], and significantly increases the natural light levels at night.<ref>{{Cite journal |last1=Kyba |first1=Christopher C. M. |last2=Tong |first2=Kai Pong |last3=Bennie |first3=Jonathan |last4=Birriel |first4=Ignacio |last5=Birriel |first5=Jennifer J. |last6=Cool |first6=Andrew |last7=Danielsen |first7=Arne |last8=Davies |first8=Thomas W. |last9=Outer |first9=Peter N. den |last10=Edwards |first10=William |last11=Ehlert |first11=Rainer |last12=Falchi |first12=Fabio |last13=Fischer |first13=Jürgen |last14=Giacomelli |first14=Andrea |last15=Giubbilini |first15=Francesco |date=2015-02-12 |title=Worldwide variations in artificial skyglow |journal=Scientific Reports |language=en |volume=5 |issue=1 |pages=8409 |doi=10.1038/srep08409 |pmid=25673335 |pmc=5389131 |bibcode=2015NatSR...5.8409K |issn=2045-2322}}</ref>
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