Researchers at the Political Economy Research Institute (PERI) at the University of Massachusetts today released the Toxic 100, an updated list of the top corporate air polluters... James K. Boyce, director of PERI's environment program [said] "We measure not just how many pounds of pollutants are released, but which are the most toxic and how many people are at risk..." The Toxic 100's top five companies are E.I. Du Pont de Nemours & Co. [DuPont], US Steel, ConocoPhillips, GE, and Eastman Kodak. [rest of top 10: ExxonMobil, Ford, Tyson Foods, Alcoa, Archer Daniels Midland.]