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PORTLAND -- A new study found one of of Oregon's two fortune 500 companies, Precision Castparts, tops a list of the most toxic air polluters in the country.

The study, just released by the University of Massachusetts, said the company poses a population health risk. They have three plants in Oregon, two in the Portland metro area, just yards from people's front doors. Castparts passed other major oil companies including Halliburton and Exxon Mobile. The University determined that toxic score by what's being released into the air. Chemicals like chromium, cobalt and aluminum.

As of Tuesday, the DEQ and the EPA both said they need more time before commenting. The DEQ added they've had no enforcement problems with the company over the past 10 years.

Precision Castparts makes complex metal components for airplanes and other applications at facilities worldwide. For their part, the company said Tuesday, We're in the process of evaluating the study.

It wasn't long ago this company made headlines for all the wrong reasons. They accidentally released a toxic plume back in May of 2011 at their plant on SE Johnson Creek.

When it happened a couple years ago, it was really scary because we didn't know what was going on and there were cops all this smoke. It makes me feel sad, there's children around here too, said neighbor Elizabeth Tate.

Many houses are just feet from the plant and there's four schools within two miles.

One former employee and neighbor, who didn't want to be identified, said he had to quit because of the chemicals, Breathing what I was breathing for the last four years put a toll on my lungs. i was lightheaded, there was dizziness, a feeling like I couldn't stand up to walk.

The company posted record earnings of almost two and a half billion last year. Boeing also made the list, coming in at no. 78.

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