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

6 minutes 52 seconds

Now Playing As: Captioned (English) (change)

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

Topic: Science
Subtopic: Ecology, Environmental Issues, Plants
Grade/Interest Level: 7 - 10
Standards:

Release Year: 2020
Producer/Distributor: PBS Digital Studios
Series: Overview
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Close-up of a section of sandstone rock from the Red River Gorge. The tan-colored rock is built up by thin layers of sediment, creating a rough, striated texture.

Split screen video. On the left, a man stands in a yard with a portable controller, operating a drone. On the right, a blurry view of mountains, pines, and rock captured by drone.

Overhead view of a tall, icy, snow-covered cliff, which a climber is rappelling down with a rope.

Bird's eye view of dense forests full of leafy tree canopies that border either side of a paved and curved two-lane road on which one car is traveling.

Black and white frame shows a man wearing personal protective equipment bending over while wielding an axe near a tree in a field as a tall fire burns in the background.

Landscape view of a sand dune dotted with grass and sea oats leading out onto the sandy beach and ocean, along which two people are walking alone.

Rural landscape with a red barn on a hill, in front of a vast forest of trees with bright fall colors, before a sloping mountain background. Scene begins to transition to a small town landscape embedded into an autumnal mountain valley.

Close-up side-angle view of a small three-ring binder full of pages of notes.

Five or six trucks gather around a herd of buffalo in a wide, dry field, appearing to corral the animals near a fence.

Drone-view of a cityscape showing multi-story buildings, high rises, tall trees, and other structures receding into the distance. In the foreground, a green courtyard surrounds a white steepled clocktower that towers over everything.