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From Scientific American - Official RSS Feed:
On a hot summer day, plumes of nitric oxide and nitrogen dioxide--collectively known as NOx--billow forth from coal-fired power plants in the eastern U.S. Along with urban concentrations of their transportation counterparts--think the tailpipes of cars and trucks--such plumes can be readily detected from space via orbiting satellites. And such space-based data reveals that NOx emissions, from power plants at least, are on the decline.
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