Environmental fate is a term describing the behavior of a chemical which is released to the environment. This is particularly important in determining whether a chemical will come in contact with a critical species or with man in sufficient concentrations to cause a toxic effect or, in contrast, be rapidly degraded to innocuous products. The Environmental Fate includes physical and chemical properties, transport and degradation studies, ambient monitoring data, and field studies. The Environmental Fate Data Base (ENVIROFATE) is composed of four interrelated files: CASLST, BIOLOG and DATALOG, and XREF. DATALOG is a data index file that indicates types of fate data available in the open literature. Each DATALOG record contains a CAS registry number, one of 18 data types relevant to environmental fate and human exposure, and an abbreviated reference. A chemical name and formula are included to aid in identification.