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"Israeli researchers say using a trio of NASA satellites has allowed them to measure levels of air pollution over the world's largest cities."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Science_News/2012/11/27/Satellites-used-to-track-global-smog-level/UPI-64711354052259/?st_rec=57151354822234>