SEATTLE -- Scientists used shellfish to conduct the broadest study to date of pollution levels along the shore of Puget Sound.
And in some places, it's pretty contaminated.
This past winter the Washington Department of Fish and Wildlife put mussels at more than 100 sites up and down Puget Sound.
After a few months, volunteers and WDFW employees gathered the shellfish and analyzed them for metals, fossil fuel pollution, flame-retardants and other chemicals. The WDFW just released the results.