How the Blue Ridge Mountains (Almost) Lost Their Blue

The Blue Ridge Mountains are known for their blue haze, caused by VOCs emitted by trees. These VOCs, while contributing to the beauty of the mountains, also play a role in forming ground-level ozone, a harmful pollutant. The region's biodiversity is due to its history as a refuge during ice ages. Pollution from coal and vehicles has historically affected air quality and visibility, but regulations like the Clean Air Act have improved conditions. The shift from coal to cleaner energy sources has further enhanced air quality, restoring the mountains' iconic blue appearance.

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