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1. AIR POLLUTION

To kill climate rule, EPA wants to redefine danger of soot

Whether it's in haze-shrouded cities, plumes of car exhaust or even clear skies, fine particle pollution can be found just about everywhere in the United States. After decades of assertions that there is no known safe level of fine particle exposure for the American public, EPA is now floating the idea of setting a threshold level of fine particles that it would consider safe.

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