From PBS Terra.

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This is our premiere episode of Overview, a show that will be publishing every three weeks on Terra.

There are a LOT of trees in the Blue Ridge Mountains, and they’re responsible for that dreamy blue haze on the horizon.

Trees produce fine mists of volatile organic compounds (VOCs), which scatter blue light waves. But these compounds are also a key ingredient in ground level ozone, and 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. Here’s what happened…

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Hosted by Joe Hanson from It’s Okay to be Smart, Overview uses incredible 4k drone footage to reveal the natural phenomena shaping our planet from a 10,000-foot view—literally.