A study, reportedly considered "alarming" examining the pollution of areas in the Great Lakes Basin was suppressed by the CDC for seven months.   The Center for Public Integrity has obtained the 400 page study and has a link to excerpts of it at their site.  Article excerpt, Sheila Kaplan, Center for Public Intergrity: 

"The Center for Public Integrity has obtained the study, which warns that more than nine million people who live in the more than two dozen “areas of concern”—including such major metropolitan areas as Chicago, Cleveland, Detroit, and Milwaukee—may face elevated health risks from being exposed to dioxin, PCBs, pesticides, lead, mercury, or six other hazardous pollutants.

In many of the geographic areas studied, researchers found low birth weights, elevated rates of infant mortality and premature births, and elevated death rates from breast cancer, colon cancer, and lung cancer."

 The article continues: