International Dark-Sky Association - The Bortle Scale rates the quality of the night sky by measuring the brightness in a particular location. The scale has nine levels and ranges from inner-city to
![Light Pollution. It is not Just About Seeing the Stars. It is an Environmental and Health Concern. — Daniel J. Stein Photography Light Pollution. It is not Just About Seeing the Stars. It is an Environmental and Health Concern. — Daniel J. Stein Photography](https://images.squarespace-cdn.com/content/v1/50bfe9cae4b08466c587fd4a/1617537391940-MN5Y6T3757YUU89OZVAJ/Bortle+Scale.jpg?format=1000w)
Light Pollution. It is not Just About Seeing the Stars. It is an Environmental and Health Concern. — Daniel J. Stein Photography
![Bortle Scale – How much does light pollution affect the nighttime skies? – Suburban Astro – Astrophotography From the Backyard Bortle Scale – How much does light pollution affect the nighttime skies? – Suburban Astro – Astrophotography From the Backyard](http://suburbanastro.com/wp-content/uploads/2011/10/bortle-scale.jpeg)