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This page provides a description and a link to a "CHAD" database that provides information needed when modeling exposure levels or performing exposure assessment.

Short Description

Consolidated Human Activity Database (CHAD) contains data obtained from pre-existing human activity studies that were collected at city, state, and national levels (ONLY U.S. data). CHAD is a master database providing access to other human activity databases using a consistent format. This facilitates access and retrieval of activity/and questionnaire information from those databases that EPA currently has access to-and-uses-in its various regulatory analyses undertaken by program offices. Data can be downloaded to own computer (dat files or access files, which are installed as a runtime version of the database) and it includes following data (U.S. level data only as Baltimore Data, Denver Data, NHAPS Data, California Data, Washington,D.C. Data, Valdez Data, Cincinnati Data, Elementary Kids Data and High School Kids Data).


Regional coverage


Key Words

time activity, time use, CHAD, consolidated human activity database