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The Indoor Environment Management Branch of NRMRL's Air Pollution Prevention and Control Division in Research Triangle Park, NC, has developed an indoor air quality (IAQ) model for analyzing the impact of sources, sinks, ventilation, and air cleaners on indoor air quality. Early versions of the model allowed calculation of indoor concentrations as a function of time. The model incorporates the latest results from EPA research on sources, sinks, ventilation, and air cleaners. The model predictions have been compared with results of test house experiments and the agreement between model predictions and experiment have been very good. The latest published version of the computer model, called RISK, is designed to allow calculation of individual exposure to indoor air pollutants from sources. The model is designed to calculate exposure due to individual, as opposed to population, activity patterns and source use. The model also provides the capability to calculate risk due to the calculated exposure. Risk is calculated using a risk calculation framework developed by Naugle et al. (1989). The model uses data on source emissions, room-to-room air flows, air exchange with the outdoors, and indoor sinks to predict concentration-time profiles for all rooms, and allows analysis of the effects of air cleaners located in either/or both the central air circulating system or individual rooms on IAQ and exposure. The model also allows simulation of a wide range of sources including long-term steady-state sources, on/off sources, and decaying sources. Several sources are allowed in each room and allows the analysis of the effects of sinks and sink re-emissions on IAQ. For more details regarding IAQ modeling visit the website at http://www.epa.gov/appcdwww/crb/iemb/model.htm. To access directly from this website, click on downloads on the navigation bar.

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