Fig. 1

Lung inflammation potential of carbon black nanoparticles (CBNPs) evaluated by the bronchoalveolar lavage fluid (BALF) analysis. BALF analysis was performed 24 h after intratracheal instillation of CBNPs at 30, 100, and 300 µg/rat. (A) The number of total cells. (B) The number of alveolar macrophages. (C) The number of granulocytes. (D) The percentage of granulocytes. Data are mean ± standard error of the mean (SEM) (n = 4 for each group). *p < 0.05 compared to the vehicle control group