Early research of the indoor air quality, or IAQ, of office buildings in the United States focused on evaluating problem buildings where occupants had significant complaints about the IAQ. However, such problem buildings could not be compared because there was very little baseline http://brus.net23.net IAQ information about typical buildings.To fill this data gap, EPA conducted the Building Assessment Survey and Evaluation (BASE) study. The BASE study used a standardized protocol to collect extensive indoor air quality data from 100 randomly selected public and commercial office buildings in 37 cities and 25 states. This website, outlined below, describes in detail the BASE study, data, highlighted analyses, original data for independent examination, and more.