The concentrations of protein, interferon-γ–inducible protein (IP)-10, soluble tumor necrosis factor receptor 1 (sTNFR1), as well as the total number of macrophages, neutrophils, and epithelial cells in the bronchoalveolar lavage fluid (BALF) of wild-type, C57BL/6 (IL-1RI+/+; solid bars) and IL-1RI–deficient (IL-1RI−/−; open bars) mice 30 minutes after the cessation of a 72-hour exposure to either room air or 0.3 ppm ozone (O3). n = 8–26 for each treatment group. *P < 0.05 compared with genotype-matched, air-exposed controls. #P < 0.05 compared with IL-1RI−/− mice within the same exposure group.