Nondegradable chemical compounds used in foam materials, clothes and food wraps are among the most valuable products of polyfluorinated chemistry. But now scientists and engineers see cause for concern that the compounds are having damaging effects on the environment — especially on water quality —and on humans. Environmental engineer and Fulton Schools Professor Rolf Halden is among those lending his expertise on the subjects of assessing the levels of risk posed by the chemicals and how to better remove the compounds if more evidence is discovered of threats arising from their use.