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epa07640277 (10/25) A man stands along a lit pathway of the Henderson Waves bridge in Singapore, 08 January 2019 A 2016 report by the Light Pollution Science and Technology Institute put Singapore as the country with the highest level of light pollution in the world, adding that it was 'not possible to view the Milky Way Galaxy anywhere in the country.' Although fundamental to urban infrastructure, artificial lighting is known to affect the natural circadian rhythm of both humans and wildlife. Ongoing studies and modeling on the broader impact are looking at links to hormone imbalance and diseases, including the occurrence of eye diseases that may be attributed to the mixed sources of lighting used often in street lighting and advertising. EPA/WALLACE WOON ATTENTION: For the full PHOTO ESSAY text please see Advisory Notice epa07640267