3M, Chemours Appeal Class of Millions of Ohioans Suing Over PFAS

3M Co., Chemours Co., and other companies want the Sixth Circuit to undo a multimillion-person class of Ohio residents with small amounts of “forever chemicals” in their blood, saying the action for medical monitoring “never should have been certified.”

The class lacks cohesion, class members differ in type, amount, and timing of their alleged exposures to PFAS, and they differ in health risks, conditions, and care, according to the petition filed in the U.S. Court of Appeals for the Sixth Circuit.

Class members also differ in their connection, if any, to the companies’ conduct, according to the Tuesday ...