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Up In the Air, Credit: William Putman, NASA/Goddard
Dust, smoke and other particles swirl in the air in this global look at aerosols, or fine particles in the atmosphere. Dust is seen in red, while ocean cyclones pick up sea salt (blue). Smoke from fires is seen in green. White tendrils represent sulfate particles, which come from both volcanoes and human fossil fuel emissions.
http://www.livescience.com/1-image-day.html
