Fig. 4: Comparison of average naphthalene concentrations in stationary samplers to other urban areas in the US.
PAH concentrations by sampling ring (current study) are shown in the black bars, while the blue bar shows the average PAH concentration across all samplers. Grey bars denote average PAH concentrations from studies in Michigan, including Detroit (Batterman et al, 2012) and rural Ohio (Paulik et al, 2016; Paulik et al., 2018).
