N. Brunetz’s research while affiliated with California State University, Sacramento and other places

... The current UFP predictions rely on source profile measurements for wood burning, food cooking, mobile sources, and non-residential natural gas combustion (Cooper, 1989;Harley et al., 1992;Hildemann et al., 1991a, b;Houck et al., 1989;Kleeman et al., 2000Kleeman et al., , 2008aRobert et al., 2007a, b;Schauer et al., 1999bSchauer et al., , a, 2001Schauer et al., , 2002aTaback, 1979). All of these size distributions were measured using appropriate instruments and methods by knowledgeable researchers, but some of these past studies were conducted more than a decade ago. ...

Reference:

Regional sources of airborne ultrafine particle number and mass concentrations in California