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. 2015 Jun 16;124(2):210–219. doi: 10.1289/ehp.1409582

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Percent increase of reactive oxygen species compared with that in untreated control cells; measured in supernatant from SAECs and THP-1 cells following a 24-hr exposure to PEPs (PM_0.1), SiO₂, and MS-WF. All values are represented as the mean ± SE. *Significantly different (p < 0.05) from PEPs (PM_0.1), dose-matched treatment group. Bar represents a significant difference in measurements across the treatment groups with p < 0.05.