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12 December 2013 1:00 pm ,
Vol. 342 ,
The iconic 125-year-old Lick Observatory on Mount Hamilton near San Jose, California, is facing the threat of closure...
Recent results from the Curiosity Mars rover have helped scientists formulate a plan for the next phase of its mission...
A new, remarkably powerful drug that cripples the hepatitis C virus (HCV) came to market last week, but it sells for $...
In pretoothbrush populations, gumlines would often be marred by a thick, visible crust of calcium phosphate, food...
Evolutionary biologists have long studied how the Mexican tetra, a drab fish that lives in rivers and creeks but has...
Victorian astronomers spent countless hours laboriously charting the positions of stars in the sky. Such sky mapping,...
In an ambitious project to study 1000 years of sickness and health, researchers are excavating the graveyard of the now...
Stefan Behnisch has won awards for designing science labs and other buildings that are smart, sustainable, and...
- 12 December 2013 1:00 pm , Vol. 342 , #6164
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ScienceShot: Imported Air Pollution
1 March 2012 4:03 pm
Homegrown air pollution is bad enough, but for years scientists have tracked pollution rising out of Asia, crossing the Pacific Ocean, and descending over the western United States. Now they are able to sort out the imported air pollution from local varieties. In the Journal of Geophysical Research, a group of atmospheric scientists and modelers reports that a new, more finely detailed model can rather accurately simulate both atmospheric circulation and the airborne chemical reactions that produce pollutant ozone. By modeling two closely monitored Asian pollution episodes in the spring of 2010, they found that the Asian contribution over the southwestern United States could amount to 15 parts per billion of ozone (orange-red on three consecutive days in panels, left to right). The current U.S. air-quality standard for ozone is 75 parts per billion. The group found that about half of the times that that threshold was exceeded, the Asian contribution was responsible for the violation. That could become even more troublesome, the authors note, if Asian imports increase as expected in the coming decades.
See more ScienceShots.