This technical report presents a summary of indoor air studies that measured background concentrations of Volatile Organic Compounds (VOCs) in the indoor air of thousands of North American residences and an evaluation and compilation of the statistical information reported in these studies. The objective of this compilation is to illustrate the ranges and variability of VOC concentrations in indoor air resulting from sources other than vapor intrusion. Similar compilations have been previously published, but these have been based on generally older data or limited statistical information.

• Background Indoor Air Concentrations of Volatile Organic Compounds in North American Residences (1990 – 2005): A Compilation of Statistics for Assessing Vapor Intrusion (PDF)(67 pp, 837 K)