"Levels of a now-banned toxic pollutant continue to decline in the tissue of coho and chinook salmon in Lake Michigan waters.

A study by researchers from the state Department of Natural Resources shows that concentrations of polychlorinated biphenyls have been falling since the industrial chemicals were prohibited in the 1970s.

The findings are good news for Lake Michigan, which has the highest concentrations of PCBs in all of the Great Lakes. It's also good for those eating the prized sport fish, although the DNR continues to recommend limiting how much salmon people regularly eat."

Lee Bergquist reports for the Milwaukee Journal Sentinel. [2]