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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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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.
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