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In July 1997, the EPA revised the National Ambient Air Quality Standards to address ambient air concentrations of particulate matter with an aerodynamic diameter of 2.5 micrometers or less (PM2.5). The carbonaceous fraction contributes generally between 25 and 70% of fine particulate mass; therefore control strategies to meet this new standard will need to address the carbon component. An important step for developing control strategies is to understand the relationship between source emissions and ambient concentrations, so-called source-receptor relationships. In this project, RJ Lee Group (RJLG) used single particle morphology and compositional information from scanning and transmission electron microscopy (SEM/TEM) to develop signatures for different sources of carbonaceous aerosol.
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