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. 2018 Jul 18;40:14. doi: 10.1186/s41021-018-0102-7

Fig. 3.

Fig. 3

Effect of N-acetyl-L-cysteine (NAC) on the increase in interleukin (IL)-8 production by collected PM dissolved in solution (1 μg/mL) without bubbling through ozone (a) and with bubbling through 0.12 ppm ozone (b) and 0.24 ppm ozone (c). The antioxidant NAC significantly inhibited the production of IL-8 induced by all collected PM dissolved in solution in a dose-dependent manner. Bars represent means ± SD. * P < 0.01