Air
Cleaning up air could harm quality of water
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By Yang Zhang and Rachael Gleason
Dec. 18, 2009
Burning coal is dirty business. The fuel is laden with heavy metals such as mercury and arsenic and chemicals that cause acid rain. When power plants burn coal, they release the contaminants into the air. Over the past couple of decades, increasingly stringent air pollution standards have forced power plants to clean up their dirty air.