Please visit the [[Human Activity Patterns|HAP Summary Page]] for a quick description of the aims, investigators, and materials associated with the Human Activity Patterns (HAP) hosted project.
The HAP project hosted on this website was begun in the early 1990's at Stanford University by Wayne Ott, John Robinson, and Paul Switzer. At that time a set of two ground-breaking activity pattern studies by the California Air Resources Board had been recently completed, and the Stanford investigators wrote several reports analyzing the data with regard to secondhand smoke exposures. Subsequently, the USEPA sponsored a large nationwide activity pattern study, called [[National Human Activity Pattern Survey (NHAPS)|NHAPS]], which interviewed Americans in 1992-1994 on their exposure to many different pollutants in household air and water. Neil Klepeis led a team that analyzed the NHAPS data for the EPA, producing a journal article and several reports ([[The National Human Activity Pattern Survey (NHAPS): A Resource for Assessing Exposure to Environmental Pollutants|Klepeis et al. 2001]]).
One of the most significant aspects of these seminal activity pattern studies, NHAPS and CAPS, were their measurement of the minute-by-minute activities of human beings over a complete 24-hour period using a computerized survey instrument. These highly-resolved activity pattern data have proved to be vital in the modeling of human exposure to hazardous air pollutants.