{"id":18885,"date":"2022-07-27T18:25:19","date_gmt":"2022-07-27T18:25:19","guid":{"rendered":"https:\/\/www.scenic.org\/?p=18885"},"modified":"2023-04-13T14:39:54","modified_gmt":"2023-04-13T14:39:54","slug":"what-is-light-pollution","status":"publish","type":"post","link":"https:\/\/www.scenic.org\/2022\/07\/27\/what-is-light-pollution\/","title":{"rendered":"What is Light Pollution?"},"content":{"rendered":"\r\n<p class=\"wp-block-paragraph\">At 4:31 am on January 17, 1994, residents of Los Angeles were shaken by two things: the <a href=\"https:\/\/www.conservation.ca.gov\/cgs\/earthquakes\/northridge\" target=\"_blank\" rel=\"noreferrer noopener\">Northridge earthquake,<\/a> and strange lights that appeared in the sky. Otherworldly and ethereal, these lights alarmed people enough to call their local emergency services to report a <a href=\"https:\/\/www.nytimes.com\/2008\/08\/31\/business\/31essay.html\" target=\"_blank\" rel=\"noreferrer noopener\">\u201cgiant silvery cloud\u201d<\/a> hovering above the city. Was it some kind of weather phenomenon? Particles in smoke? UFOs?<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">No, the mysterious lights were something far older, something forgotten: the <a href=\"https:\/\/www.amnh.org\/explore\/ology\/astronomy\/the-milky-way-galaxy2\" target=\"_blank\" rel=\"noreferrer noopener\">Milky Way Galaxy,<\/a> our home in the universe. In the city-wide blackout caused by the earthquake, it was visible for the first time in decades.<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18886\" src=\"https:\/\/develop-scenic-america.pantheonsite.io\/wp-content\/uploads\/2022\/07\/LA_light_pollution.jpg\" alt=\"\" width=\"651\" height=\"435\" srcset=\"https:\/\/www.scenic.org\/wp-content\/uploads\/2022\/07\/LA_light_pollution.jpg 636w, https:\/\/www.scenic.org\/wp-content\/uploads\/2022\/07\/LA_light_pollution-300x200.jpg 300w\" sizes=\"auto, (max-width: 651px) 100vw, 651px\" \/>\r\n<figcaption>Los Angeles at night, photo courtesy of International Dark Sky Association<\/figcaption>\r\n<\/figure>\r\n<\/div>\r\n\r\n\r\n<p class=\"wp-block-paragraph\">In major cities and small towns across the globe, <strong>light pollution<\/strong> veils the scenic beauty of the night sky. Here\u2019s a look at that pollution and its causes and effects.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>What Is Light Pollution?<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.darksky.org\/light-pollution\/\" target=\"_blank\" rel=\"noreferrer noopener\">Light pollution<\/a> is defined as artificial light that is unwanted or unnecessary. These are the four main <strong>types of light pollution<\/strong>, along with some <strong>light pollution examples<\/strong>:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Glare:<\/strong> Excessive brightness or unshielded lighting that causes visual discomfort or blindness. Think of a passing car with too-bright headlights that make you squint.<\/li>\r\n<li><strong>Clutter:<\/strong> Grouped sources of bright light that are distracting, confusing, or excessive. Times Square is an oft-cited example.<\/li>\r\n<li><strong>Light Trespass:<\/strong> Light extending into unwanted or unnecessary areas, like a street light illuminating a darkened bedroom.<\/li>\r\n<li><strong>Sky Glow:<\/strong> Brightening of the night sky due to artificial light, usually from urban areas. This is what obscures the Milky Way over Los Angeles and many other cities around the world.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>What Causes Light Pollution?<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/education.nationalgeographic.org\/resource\/light-pollution\" target=\"_blank\" rel=\"noreferrer noopener\">Light pollution<\/a> is the result of <a href=\"https:\/\/www.darksky.org\/light-pollution\/energy-waste\/\" target=\"_blank\" rel=\"noreferrer noopener\">inefficient artificial lighting.<\/a> While electric lights are undoubtedly crucial aspects of our lives, society, and industry, they often go above and beyond their purpose\u2014in a negative way. It\u2019s estimated that about <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC2627884\/#:~:text=How%20Outdoor%20Lighting%20Translates%20into%20Light%20Pollution\" target=\"_blank\" rel=\"noreferrer noopener\">50% of illumination from a typical light source is wasted<\/a> by being directed upward at the sky. A further 10% emits horizontally, creating glare. That leaves only 40% of your average light source to illuminate its intended target.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">When you multiply this excessive illumination with often over-abundant lighting, it\u2019s easy to see how artificial light can glow with <a href=\"https:\/\/www.globeatnight.org\/light-pollution.php\" target=\"_blank\" rel=\"noreferrer noopener\">overpowering brightness.<\/a><\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18888\" src=\"https:\/\/develop-scenic-america.pantheonsite.io\/wp-content\/uploads\/2022\/07\/0x0-1024x576.jpg\" alt=\"\" width=\"574\" height=\"322\" srcset=\"https:\/\/www.scenic.org\/wp-content\/uploads\/2022\/07\/0x0-1024x576.jpg 1024w, https:\/\/www.scenic.org\/wp-content\/uploads\/2022\/07\/0x0-300x169.jpg 300w, https:\/\/www.scenic.org\/wp-content\/uploads\/2022\/07\/0x0-768x432.jpg 768w, https:\/\/www.scenic.org\/wp-content\/uploads\/2022\/07\/0x0.jpg 1200w\" sizes=\"auto, (max-width: 574px) 100vw, 574px\" \/>\r\n<figcaption>Photo courtesy of Forbes<\/figcaption>\r\n<\/figure>\r\n<\/div>\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Light Pollution Effects<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">A little extra light might seem relatively harmless on the surface, but light pollution has a variety of damaging impacts\u2014especially when it comes to the <strong>effects of light pollution on the environment<\/strong>. Excessive artificial light is particularly harmful for nocturnal wildlife, and can cause disruptions in their <a href=\"https:\/\/www.nigms.nih.gov\/education\/fact-sheets\/Pages\/circadian-rhythms.aspx#:~:text=Circadian%20rhythms%20are%20physical%2C%20mental,the%20study%20of%20circadian%20rhythms.\" target=\"_blank\" rel=\"noreferrer noopener\">circadian rhythms<\/a>. Additionally, sky glow and clutter can be confusing for migratory animals like birds and <a href=\"https:\/\/conserveturtles.org\/information-sea-turtles-threats-artificial-lighting\/\" target=\"_blank\" rel=\"noreferrer noopener\">sea turtles,<\/a> who rely on the position of celestial bodies to orient themselves.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC2627884\/\" target=\"_blank\" rel=\"noreferrer noopener\">Light pollution affects human health<\/a> by disrupting our own circadian rhythms and lowering melatonin levels. It also makes astronomers\u2019 work more difficult, while preventing millions of people from seeing the beauty of the <strong>night sky without light pollution<\/strong>.<\/p>\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18892\" src=\"https:\/\/develop-scenic-america.pantheonsite.io\/wp-content\/uploads\/2022\/07\/killarney-observatory-night-sky.jpg\" alt=\"\" width=\"414\" height=\"232\" srcset=\"https:\/\/www.scenic.org\/wp-content\/uploads\/2022\/07\/killarney-observatory-night-sky.jpg 940w, https:\/\/www.scenic.org\/wp-content\/uploads\/2022\/07\/killarney-observatory-night-sky-300x169.jpg 300w, https:\/\/www.scenic.org\/wp-content\/uploads\/2022\/07\/killarney-observatory-night-sky-768x432.jpg 768w\" sizes=\"auto, (max-width: 414px) 100vw, 414px\" \/>\r\n<figcaption>A sky without light pollution, photo courtesy of CBC<\/figcaption>\r\n<\/figure>\r\n<\/div>\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Here at Scenic America, we value our country\u2019s scenic beauty and want to see it persist. We work to preserve the <a href=\"https:\/\/develop-scenic-america.pantheonsite.io\/visual-pollution-issues\/scenic-byways\/about-scenic-byways\/\" target=\"_blank\" rel=\"noreferrer noopener\">Scenic Byways,<\/a> landscapes, and towns that define our nation\u2019s visual character. Read about our <a href=\"https:\/\/develop-scenic-america.pantheonsite.io\/about-us\/mission\/seven-principles-scenic-conservation\/\" target=\"_blank\" rel=\"noreferrer noopener\">principles of conservation,<\/a> see <a href=\"https:\/\/develop-scenic-america.pantheonsite.io\/about-us\/annualreport\/\" target=\"_blank\" rel=\"noreferrer noopener\">what we\u2019ve accomplished<\/a> in 2021, or <a href=\"https:\/\/scenic.salsalabs.org\/join\/index.html\" target=\"_blank\" rel=\"noreferrer noopener\">sign up for our newsletter <\/a>to stay up-to-date on our work and <a href=\"https:\/\/develop-scenic-america.pantheonsite.io\/chapters-affiliates\/pittsburgh\/take-action\/acting-in-your-community\/\" target=\"_blank\" rel=\"noreferrer noopener\">how you can help.<\/a><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Scenic America\u2019s mission is to preserve and enhance the visual character and scenic beauty of America. <a href=\"https:\/\/scenic.salsalabs.org\/donate\/index.html\" target=\"_blank\" rel=\"noreferrer noopener\">Donate today<\/a> to help us protect our beautiful places and the heart of our country\u2019s character!<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>At 4:31 am on January 17, 1994, residents of Los Angeles were shaken by two things: the Northridge earthquake, and strange lights that appeared in the sky. Otherworldly and ethereal, these lights alarmed people enough to call their local emergency services to report a \u201cgiant silvery cloud\u201d hovering above the city. Was it some kind [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":18892,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[24],"tags":[],"class_list":["post-18885","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-billboards"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Light Pollution? | Scenic America<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.scenic.org\/2022\/07\/27\/what-is-light-pollution\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is Light Pollution? | Scenic America\" \/>\n<meta property=\"og:description\" content=\"At 4:31 am on January 17, 1994, residents of Los Angeles were shaken by two things: the Northridge earthquake, and strange lights that appeared in the sky. 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