Your kitchen cabinets could do more than hold your plates and food. For a new study published in the journal Environmental Science & Technology, researchers found kitchen cabinets are an indoor source of airborne polychlorinated biphenyl compounds (PCBs) which have been linked to a variety of health problems, and are considered a carcinogen. It’s believed the harmful chemical compounds are a byproduct of the breakdown of a common sealant used in modern kitchen cabinetry. Though manufacturing of PCBs was banned in 1979, the compounds are slow to decay and tend to stick around the environment, so they’re still found in a variety of places. For this study, scientists collected air samples from 16 homes in Iowa over six weeks. They were surprised to find higher concentrations of the compounds in houses that were built more recently.