The report gives results of an analysis of source and ambient concentration data for polycyclic organic matter (POM). Based on the literature reviewed, POM data were summarized and the sampling and analytical techniques were critiqued and evaluated against state-of-the-art technology. The objective was to determine the scientific and engineering credibility of a previously established POM data base by an evaluation of the sampling and analytical techniques employed. (POM is an unregulated class of pollutants which is a potential candidate for regulatory action as outlined in Section 122a of the Clean Air Act Amendments of 1977). It was concluded that sampling techniques contain uncertainties that limit the usefulness of these data in an environmental assessment of POM. The uncertainties include the possibility of the incomplete capture of POM during emission sampling, the chemical degradation of the collected sample during both emission source and embient sampling, and the unproven reliability of benzo(a)pyrene as an indicator of total POM from emission sources or in ambient media. The uncertainties may be compounded by losses during analysis. Also, since it is not feasible to quantify all the POM which may be present in an environmental sample, the number of POMs reported will reflect the scope of the analytical strategy and the limitations of the analytical technique employed.

"Research Triangle Institute." "EPA 600-7-80-044 ." "March 1980." Cover title. Includes bibliographical references (pages B-1-B-27). "Contract no. 68-02-2612, task no. 86, program element no. INE623."