The paper discusses screening methods for identifying organic emissions from indoor air pollution sources. The development of on-line gas chromatographic (GC) screening procedures is necessary to permit subsequent evaluation of materials in test chamber studies. The screening uses techniques such as static vapor-phase sampling by headspace methods, and a dynamic method similar to the purge-and-trap procedures used for determining volatile organic compounds in water samples. These are methods of sampling that simulate chamber conditions on a small scale, while allowing emissions to be collected and analyzed. The evaluation is done to select GC columns and develop operating conditions that will permit the rapid and reliable separation of chemical compounds generated during testing. The GC procedure is used in the qualitative identification of chemical compounds by GC/mass spectrometry (MS). After identification of the compounds or their chemical classes, representative members are selected as calibration standards for the actual emission testing program.