What is light pollution?
Answer: The human-made alteration of outdoor light levels from those occurring naturally. Learn more
What causes light pollution?
Who and what are affected by light pollution?
What can we do about light pollution?
Spread the word
Resources you can use to teach policy makers, businesses, and the general public about light pollution.
Educational brochures, presentations, infographics, and more. Download or order printed copies.
Easily downloaded lesson plans for teachers and educational activities for kids.
Ways to engage in the dark sky movement with your loved ones — in your backyard, through your living room window, or on a computer screen.
Light pollution solutions
Renters don’t have as much flexibility as property owners to change their outdoor lighting, but we have some advice for renters and apartment complexes.
What you can do when a neighbor installs a new, unshielded light on their property that spills onto your property and perhaps even inside your home. This is known as light trespass.
Few HOAs include outdoor lighting requirements in their covenants, conditions, and restrictions (CC&Rs). DarkSky has approved model CC&Rs that are dark sky friendly.
You’re part of the solution!
People just like you are already involved in the global dark sky movement! You can be part of the solution too.
The science of outdoor lighting
The ALAN database (off-site link) provides references to scientific literature on all aspects of research into artificial light at night, a joint effort between DarkSky and the Loss of the Night Network.
Solving light pollution requires data, and a great way to do that is to measure the brightness of the night sky. It’s relatively easy to make such measurements, and you can help!
You don’t need to be a scientist to study light pollution! Surveys using sky quality meters (SQMs) are one way we can collect data on our brightening skies.
Dark sky principles
By incorporating these principles, properly designed electric lighting at night can be beautiful, healthy, and functional.
A resolution by DarkSky’s board of directors that expands on The Five Principles for Responsible Outdoor Lighting.
By following the ROLAN manifesto, governments, businesses, and individuals can support the implementation of the United Nations sustainable development goals.
Lighting policy and ordinances
How to identify whether your community has an outdoor lighting ordinance, how to advocate for an ordinance, and how to ensure that an ordinance is enforced.
Why municipalities should be concerned about light pollution.
Few HOAs include outdoor lighting requirements in their Covenants, Conditions, and Restrictions (CC&Rs). DarkSky has approved model CC&Rs that are dark sky friendly.
The five lighting zones, LZ0 through LZ4, reflect the base (or ambient) light levels desired by a community, and are used when writing legislation for light pollution.
The MLO provides suggested lighting ordinance language and is designed to help municipalities develop outdoor lighting standards that reduce glare, light trespass, and sky glow.
A free planetarium show introducing and illustrating some of the issues around light pollution and suggesting three simple actions people can take to help mitigate it. Available in many formats and languages.
A collection of videos about dark sky issues.
Videos from our staff, Advocates, and more. This is also where you can find recordings of DarkSky virtual events such as our annual Under One Sky global conference.
Informational images that can help people understand the complex issues of light pollution. Free downloads.
FAQs and Glossary
Do you have a question about light pollution, outdoor lighting, or what DarkSky does? Then check out our Frequently Asked Questions page.
Everything you need to know about applying for Dark Sky Place certification and our nocturnal conservation program.
Our award-winning members-only magazine provides current news about DarkSky and night sky protection and in-depth articles on DarkSky programs, light pollution issues, and protecting the night sky.
Our annual reports quantify the impact of our work around the globe, ranging from success stories and stats to financials.