The exposure data landscape for manufactured chemicals

► Exposure-related information is available for less than one-fifth of chemicals with toxicity information. ► An even smaller fraction has readily accessible concentrations in exposure-related media. ► Resources have been focused on substances thought to pose a hazard to human health. ► Available exposure data are insufficient to inform risk assessment and public health decision making. ► Increased data sharing is needed to widen the breadth of available exposure data.