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. 2006 Jun 12;114(9):1387–1393. doi: 10.1289/ehp.9234

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Inflammatory potency varies with site and season. (A) Total cells. (B) Polymorphonuclear leukocytes. (C) Macrophages. (D) Lymphocytes. (E) Histopathologic inflammation. (F) Lung weight:body weight ratio. Bars represent potencies for the inflammatory end points (mean and SE).

Letters above the bars indicate samples within a season that are not significantly different from each other; “+” and “–” indicate potency significantly greater than and less than, respectively, the potency of the sample from the same site in the winter. *Potency significantly different from 0.