Chapter 4 - Chemical Mass Balance

This chapter presents the derivation and basic assumptions of the Chemical Mass Balance (CMB) receptor model and describes a protocol for its application and validation. The potential for using the CMB framework for the source apportionment of ambient air pollutants other than suspended particulate matter, indoor and workplace air pollutants, and toxic species found in landfills and water is being actively explored, but has no regulatory status at this time. Like any other model, the CMB must be used within the confines of its limitations. Both the software and the applications and validation protocol have been constructed to make the user aware of those limitations and to force recognition of them. The CMB has always been intended for use with other source and receptor models. Using these models together provides a greater ability to apportion pollutants to individual emitters. The chapter also provides a check on the results of each of the modeling systems.

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