“…4 For recent research on the possible health effects of exposures to fine particulates see Krewski et al (2009), Lepeule et al (2012), and Fann et al (2012a). For recent debate and discussion about the way uncertainties about the health effects of fine particle exposures are addressed in the evaluation of air quality regulations, see Cox (2012), Fann et al (2012b), Fraas and Lutter (2013a,b), Fann, Lamson, Anenberg, and Hubbell (2013), Smith and Gans (2014), and Fann, Lamson, Luben, and Hubbell (2015). mortality risk.…”