National Geographic News, Reporting Your World Daily

Thursday, October 28, 2010

Photo: "Chemical Equator" Divides Earth's Hemispheres


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The "chemical equator" (depicted above north of Australia), acts as a barrier between the Northern Hemisphere's heavy pollution and the Southern Hemisphere's cleaner air. The boundary is 31 miles (50 kilometers) wide and spans the globe.

Image courtesy Jacqueline Hamilton/University of York