USEPA toxicity information in the database
The HBSL database contains U.S. Environmental Protection Agency (USEPA) cancer classifications and toxicity values (oral Reference Dose (RfD) and oral Slope Factor (SF) values). Data are collected from three USEPA offices and four data sources. See "What hierarchy of toxicity information is used to calculate HBSLs?" and "How are HBSLs calculated?" for more information about USEPA cancer classifications and toxicity values.