A study of multifamily buildings that produced valuable data on inter-unit air flows. From the website: "This project included in-depth owner interviews, a survey of a large sample of renters, legal research and measurements of the movement of PFTs and SHS tracers between units in apartment buildings before and after air sealing and ventilation treatments. The project produced some of the most extensive multiple fan measurements of inter-apartment air leakage and multiple tracer gas measurements of inter-apartment air transfer. It also developed a new metric of 'effective contaminant transfer' which is used to define the magnitude of the transfer of a contaminant source to the monitored location."

The Indoor Environment Department (IED) at Lawrence Berkeley National Laboratory (LBL) in Berkeley, CA (USA) is a world class research group in indoor air pollution, pollutant dynamics, pollutant dispersion, ventilation, and air flow modeling. One of the lab's main goals is "...understanding human exposures to environmental pollutants found in indoor and outdoor air." Many of the IED's publications are available for download

USEPA-NERL is a United States government laboratory dedicated to research on human exposure. The lab funds exposure studies and conferences, develops exposure software, and informs health-related policy. The EPA publishes the Exposure Factors Handbook, which contains much data relevant to the modeling of human exposure.