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Nine male subjects (56-71 years) were exposed to filtered air (FA) or 0.45 ppm O 3 with inhaled dose altered by varying ventilation volume (V E = 25, 40, or 55 L/min (BTPS)) to evaluate pulmonary function dose-responses in older men. The subjects walked on a motor-driven treadmill and rested in alternating 20-min periods during the 2-h exposures. Functional residual capacity and...