TOXMAP uses the most current, final TRI data available from the EPA. Data submission deadlines, data entry processes, and data quality control and review all influence the actual date of data release both by the EPA and by TOXMAP.
Some TRI chemicals have no reported releases, and so will not appear in the TRI release data or in TOXMAP. A complete list of chemicals currently listed in TOXMAP can be found at http://toxmap-classic.nlm.nih.gov/toxmap/main/chemicals.jsp.
A complete list of TRI chemicals required to be reported to the EPA can be found at http://www2.epa.gov/toxics-release-inventory-tri-program/tri-listed-chemicals.