In an analysis published this week in the journal Environmental Science & Technology, University of Iowa researchers tested 16 homes and found that three types of PCBs were elevated in some of the homes.

First-of-its-kind study finds finished cabinetry is a major source of PCBs inside people's homes. Scientists suspect wood sealants are the culprit.

While investigating sources of polychlorinated biphenyl compounds inside the home, scientists identified airborne PCBs being emitted by kitchen cabinetry.