Fig. 1From: Ozone augments interleukin-8 production induced by ambient particulate matterConcentrations of interleukin (IL)-8 (a) and IL-6 (b) in the supernatants of THP1 cells stimulated by collected particulate matter (PM) dissolved in solution (1 μg/mL) with and without bubbling through ozone. Bars represent means ± SD. *P < 0.01 and **P < 0.05Back to article page