Comparison of manufactured Fe2O3 and SiO2 nanoparticles to soil-derived dusts (DD, JE, MC) at 53 μg/cm2 and to positive controls at concentrations listed in Table 1. IL-6 concentration in pg/mL, mean ± standard error of the mean (95% confidence interval) based on 5 independent experiments. Note the discontinuity in the Y-axis scale. A. KGM media with BSA 0.1% BSA. B. LHC-9 with 0.1% BSA.