BALF cytotoxicity (LDH) and oxidative stress (8-isoprostane) markers. Data were expressed as fold increases of exposed groups compared to controls. Bars represent the mean value and the standard error on the mean obtained for 6 rats in each exposure group. LDH assay for each rat was done in triplicate and 8-isoprostane was in duplicate. Statistical procedures: ANOVA followed by a Tukey’s test. * Mean value is statistically different from control level p < 0.05; ** Mean value is statistically different from control level and 10–30; 50 nm SA aerosols p < 0.05; ŧ Mean value is statistically different from all LA aerosol levels p < 0.05.