The paper discusses a model that allows analysis of individual exposure for a wide ange of sources and sinks. (NOTE: Individual exposure to air pollutants is determined by the behavior of indoor sources and sinks and activity patterns.) The discussion emphasizes exposures to volatile organic compounds (VOCs) from commonly used sources. The effects of source and sink behavior on exposure are complex. Important factors include source strength, source decay rate, rates to the sink, re-emissions from the sink, and such building operation parameters as ventilation rate. Sources provide the primary exposure and dominate exposure while the source strength is strong. Sink modify exposure by reducing peak concentrations and, because of re-emissions from sinks, by increasing the time of relatively high concentrations. Exposures from several sources are analyzed both with and without sinks and under a range of building operation scenarios. The need for standard scenarios in evaluating the effects of sources on individual exposure is discussed. Model concentration predictions are compared with data from an indoor air quality test house.