On a clear day, you can’t actually see forever — if you follow the blue sky out to the horizon, you will often see it become somewhat more pale and opaque, owing to ‘visible pollution,’ or “haze” — the result of the interaction of sunlight with particulate matter in the air.
Before the modern industrial age, haze was largely attributed to wind-blown dust, soot from wild-fires, and other types of volatile organic compounds (VOC) released by trees and plants into the atmosphere from America’s vast …
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