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Pollution
Aug. 3, 2012 A sunset during an aerosol-ejecting Colorado wildfire in June 2012. (Brian Emory) By: Wynne Parry Nearly half of the tiny droplets and particles suspended high in the atmosphere over North America comes from other continents, an examination of satellite data reveals. "That is a big number: half. I wasn't expecting anything like that," study researcher Lorraine Remer of the University of Maryland says in a video released in conjunction with the new study on aerosols. Specifically, the research team found that 70.5 million tons (64 teragrams) of foreign aerosols - which include naturally occurring dust as well as pollution - arrive over North America every year. Meanwhile, ...
