. . . . . "Elevated House Dust and Serum Concentrations of PBDEs in California: Unintended Consequences of Furniture Flammability Standards?" . . . . . . . . "House dust and human serum concentrations of penta-BDE congeners are substantially higher in California than the rest of the United States." . . . . "Studies show higher house dust and body burden levels of PBDE flame retardants in North America than Europe; but little is known about exposure variation within North America, where California\u2019s furniture flammability standard affects PBDE use. We compared dust samples from 49 homes in two California communities with 120 Massachusetts homes and with other published studies. Dust concentrations [median (range) ng/g] in California homes of BDE-47, -99, and -100 were 2700 (112-107 000), 3800 (102-170 000), and 684 ( .