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Raw 264.7 (A) and A549 cells (B) were treated up to 72h with or without pristine TiO2 NF (range dose 2.5–80 μg/cm2), crocidolite (Cro; 80 μg/cm2) or TiO2 NP (80 μg/cm2), and cell viability was assessed with the resazurin assay. Data are means ± SD of twelve independent determinations obtained in three experiments. * p < 0.05, ** p < 0.01, *** p < 0.001 vs. control (untreated cultures).
