Consolidated Human Activity Database (CHAD) - Documentation for CHAD-Master

EPA maintains the Consolidated Human Activity Database (CHAD). CHAD contains data obtained from pre-existing human activity studies that were collected at city, state, and national levels. CHAD is intended to be an input file for exposure/intake dose modeling and/or statistical analysis. The documents below describe CHAD and its use.

• CHAD Documentation and User’s Guide (pdf) (4.02 MB, October 2019, EPA-452/B-19-001)
• Technical Memo, CHAD-APEX Updates - June 2019 (pdf) (883.78 KB)
  Further updates to CHAD