Portland-based Precision Castparts called a report that named them the nation's top air polluter "deeply flawed."
Precision ranked No. 1 despite a relatively low volume of emissions because of its plants' proximity to population centers and reportedly higher toxicity. One-third of Precision's pollutant score came from Portland-area plants that emit cobalt and cobalt compound.
The Oregon Department of Environmental Quality confirmed Thursday that Precision is in compliance with its emissions permits and hasn't been the target of an enforcement action in at least a decade.
Read more at OregonLive.com.