Science

Particulate matter

Environmental IssuesEnvironmental PoliticsNRG Energy IncorporatedU.S. Environmental Protection Agency
Exhaust rises from smokestacks in front of piles of coal at NRG Energy's W.A. Parish Electric Generating Station in Texas in 2011. The Environmental Protection Agency proposed new rules Thursday that would lower the amount of fine particulate matter, or soot, that enters the air from sources... David J. Phillip / Associated Press
Loading