skip to main content

Overview: How the Blue Ridge Mountains (Almost) Lost Their Blue

6 minutes 52 seconds

Now Playing As: Captioned (English) (change)

Report a Problem

The trees in the Blue Ridge Mountains are responsible for that dreamy blue haze on the horizon. Trees produce fine mists of volatile organic compounds (VOCs), which scatter blue light waves. In the mid-90s, the area had serious air quality issues. Not only was it dangerous to breathe, the hazy blue was disappearing from the horizon. But it wasn’t just the trees fault. Part of the "Overview" series.

Media Details

Runtime: 6 minutes 52 seconds

Recently Added
Still image from: Overview: How the Blue Ridge Mountains (Almost) Lost Their Blue
Overview
Season 1 / Ep 1
6 minutes 52 seconds
Grade Level: 7 - 10
Recently Added
Still image from: Overview: Meet the Fire Lookout of Big Sky Country
Overview
Season 1 / Ep 2
7 minutes 51 seconds
Grade Level: 10 - 12
Recently Added
Still image from: Overview: Wild Horses-- America's Most Beloved Invasive Species?
Overview
Season 1 / Ep 3
7 minutes 24 seconds
Grade Level: 10 - 12
Recently Added
Still image from: Overview: Unlocking the Mysteries of Autumn Leaves
Overview
Season 1 / Ep 4
7 minutes 12 seconds
Grade Level: 10 - 12
Recently Added
Still image from: Overview: Climber's Paradise Is the Last Refuge for an Ancient Species
Overview
Season 1 / Ep 5
8 minutes
Grade Level: 7 - 12
Recently Added
Still image from: Overview: Who Made These Giant Desert Figures...and Why?
Overview
Season 1 / Ep 6
7 minutes 19 seconds
Grade Level: 10 - 12
Recently Added
Still image from: Overview: How Bison Are Saving America's Lost Prairie
Overview
Season 1 / Ep 7
8 minutes 28 seconds
Grade Level: 9 - 12
Recently Added
Still image from: Overview: Flight Lessons From a World Champion Drone Racer
Overview
Season 1 / Ep 8
7 minutes 49 seconds
Grade Level: 7 - 12
Recently Added
Still image from: Overview: How a Mind-Blowing World of Ice Gets Made
Overview
Season 1 / Ep 9
7 minutes 46 seconds
Grade Level: 7 - 12
Recently Added
Still image from: Overview: Humans Cause Traffic Jams, AI Can Fix Them
Overview
Season 1 / Ep 10
9 minutes 45 seconds
Grade Level: 9 - 10