Less than 100 years ago, everyone could look up and see a spectacular starry night sky.
Now, millions of children across the globe will never experience the Milky Way where they live.
The increased and widespread use of artificial light at night is not only impairing our view of the universe,
it is adversely affecting our 
environment, our safety, our energy consumption and our health.


What is Light Pollution?

Most of us are familiar with air, water, and land pollution, but did you know that light can also be a pollutant?

The inappropriate or excessive use of artificial light – known as light pollution – can have serious environmental
consequences for humans, wildlife, and our climate.

Components of light pollution include:

    1. Glare – excessive brightness that causes visual discomfort
    2. Skyglow – brightening of the night sky over inhabited areas
    3. Light trespass – light falling where it is not intended or needed
    4. Clutter – bright, confusing and excessive groupings of light source

      Light pollution is a side effect of industrial civilization. 
      Its sources include building exterior and interior lighting, advertising,
      commercial properties, offices, factories, streetlights,
      and illuminated sporting venues.

      The fact is that much outdoor lighting used at night is inefficient,
      overly bright, poorly targeted, improperly shielded, and, in many cases,
      completely unnecessary. This light, and the electricity used to create it,
      is being wasted by spilling it into the sky, rather than focusing it on to
      the actual objects and areas that people want illuminated.

How Bad is Light Pollution?

With much of the Earth’s population living under light-polluted skies, over lighting is an international concern.
If you live in an urban or suburban area all you have to do to see this type of pollution is go outside at night
and look up at the sky.

According to the 2016 groundbreaking “World Atlas of Artificial Night Sky Brightness,”
80 percent of the world’s population lives under skyglow.
In the United States and Europe 99 percent of the public can’t experience a natural night!


If you want to find out how bad light pollution is where you live, use this interactive map created
from the”
World Atlas” data or the NASA Blue Marble Navigator for a bird’s eye view of the lights in
your town. Google Earth users can 
download an overlay also created from the “World Atlas” data.
And don’t forget to c
heck out the Globe at Night interactive light pollution map data created with
eight years of data collected by citizen scientists.

NASA Blue Marble Navigator   

                         NASA Blue Marble Navigator                                                    Globe at Night light pollution map


Effects of Light Pollution

For three billion years, life on Earth existed in a rhythm of light and dark that was created solely
by the illumination of the Sun, Moon and stars. Now, artificial lights overpower the darkness and
our cities glow at night, disrupting the natural day-night pattern and shifting the delicate balance of
our environment. The negative effects of the loss of this inspirational natural resource might seem intangible.
But a growing body of evidence links the brightening night sky directly to measurable negative impacts including

Light pollution affects every citizen. Fortunately, concern about light pollution is rising dramatically.
A growing number of scientists, homeowners, environmental groups and civic leaders are taking action to
restore the natural night. Each of us can implement practical solutions to combat light pollution
locally, nationally and internationally.

You Can Help!

The good news is that light pollution, unlike many other forms of pollution, is reversible and each one of us
can make a difference! Just being aware that light pollution is a problem is not enough; the need is for action.
You can start by minimizing the light from your own home at night. You can do this by following these simple steps.

  • Learn more. Check out our Model Lighting Laws & Policy
  • Only use lighting when and where it’s needed
  • If safety is concern, install motion detector lights and timers
  • Properly shield all outdoor lights
  • Keep your blinds drawn to keep light inside
  • Become a citizen scientist and helping to measure light pollution

Learn more about Outdoor Lighting Basics

Then spread the word to your family and friends and tell them to pass it on. Many people either don’t know or
don’t understand a lot about light pollution and the negative impacts of artificial light at night. By being an ambassador and explaining the issues to others you will help bring awareness to this growing problem and inspire more people to
take the necessary steps to protect our natural night sky. IDA has many valuable resources to help you including 
Public Outreach MaterialsHow to Talk to Your NeighborLighting Ordinances and Residential and Business Lighting.




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