CHAD is a database that includes many useful activity pattern data sets, and can be downloaded from the USEPA website. It includes the National Human Activity Pattern Survey (NHAPS) data.

From the website: " [The] Consolidated Human Activity Database (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. 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 ...."

USEPA report containing a first analysis of data from the 1992-94 National Human Activity Pattern Survey (NHAPS)

USEPA report containing many descriptive statistics tables based on the diary and main data from the 1992-94 National Human Activity Pattern Survey (NHAPS).

Article on the national human activity pattern survey (NHAPS), which interviewed 9,386 Americans by telephone on their potential exposure to household air and water contaminants