Scientists have long known about the life-threatening impact of
air pollution -- but up until now, tracking it globally with any accuracy had been out of reach. With new satellite-based imaging, however, researchers are getting their first peek at how particulate matter is distributed around the world, and in places where air pollution had been difficult to measure with any accuracy before -- an important step towards better understanding of a problem that epidemiologists say contribute to millions of
premature deaths every year.
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