Abstract : A 3-year program of research oriented toward the formation/transport of combustion-generated particles is summarized. Using thermophoretic sampling/TEM image analysis techniques, both inorganic (alumina) and carbonaceous soot aggregates have been shown to exhibit quantitatively similar morphologies. A thermophoresis-based method for measuring absolute local soot volume fractions, fv, in flames has been successfully implemented (in both co-flow and counterflow laminar diffusion flames). Called Thermocouple Particle Densitometry (TPD), it exploits the laws governing thermocouple response to the thermophoretic soot deposition, as first suggested by Eisner and Rosner in 1985. This method is independent of (often unknown) soot optical properties, unbiased with respect to soot morphology and size distribution, and yields spatially resolved fv values directly even at low soot concentrations (below 0.1 ppm). Accordingly, while neither "instantaneous" or "non-intrusive", it is especially applicable to spatially non-uniform and/or lightly sooting laminar steady flames. Ancillary studies of the transport properties of soot aggregates, and particle impaction on cylinders in high-speed crossflow are also described/documented among the 30 cited references emerging from this program(Section 5).