EPA_Using WARM Emission Factors for Materials and Pathways Not in WARM

EPA’s Waste Reduction Model (WARM) recognizes 54 material types, and that number continues to grow. However, users may still find that some materials and pathways of interest to them are not represented in the model. In such cases, WARM users often apply WARM factors for materials that seem similar to the non-WARM material in which they are interested. This document discusses some of the limitations of using WARM materials as proxies for non-WARM materials, and provides EPAapproved WARM proxies for some commonly-requested non-WARM materials.