EPA has finally released its study of the chemical exposures that occur for consumers of microwave popcorn. EPA had previously refused to release the study to the public. The study includes information on consumer exposure to diacetyl, the butter flavoring chemical known to cause lung disease. Much of the furor over diacetyl has related to those exposed during the manufacturing process, but consumers are also at risk. The Pump Handle blog has an analysis of the study: "EPA Microwave Popcorn Emissions Study Finally Published"