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Last updated on April 23, 2014 at 1:22 EDT

‘Imported’ Dust Fills American Skies

August 3, 2012

NASA and university scientists have made the first measurement-based estimate of the amount and composition of tiny airborne particles that arrive in the air over North America each year. With a 3D view of the atmosphere now possible from satellites, the scientists distinguished dust from pollution, and calculated that dust is the main ingredient of these foreign imports.   credit:  NASA