The paper gives an overview of an EPA data base on the sources of indoor air pollution emissions, and discusses its potential for use in developing pollutant profiles and emission rate data. EPA's AEERL has been working the past 3 years to develop a data base covering the international technical literature on sources of indoor air pollution. The computerized system provides an archive for experimentally determined data from source characterization studies. It focuses on organic emissions and can provide pollutant profiles and emission rates for a variety of building materials and unvented combustion sources. Data base operation consists of three segments: data query, data input, and data output. Data query is user-friendly, consisting of menu screens that allow the user to manipulate up to three variables to describe and locate a specific data need. Data input is accomplished through similar screens by responding to menu-driven prompts, a feature that allows the user to customize the data base for personal data needs and can also facilitate the exchange of information between users. Data output is through screen displays or a printer interface.