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. 2008 Apr 21;116(8):1023–1026. doi: 10.1289/ehp.11396

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Cross-study comparison of mean O₃-induced FEV₁ decrements due to 6.6 hr of constant, S-W exposure to varied O₃ concentrations. All exposures were conducted in a chamber, except for a face-mask exposure to 0.04 ppm O₃ in the Adams (2002) study. All studies used a 6.6-hr exposure protocol in which volunteers alternated between 50 min of exercise (V_E ≈ 20 L/min/m² BSA) and 10 min of rest with an additional 35 min of rest after the third hour. For this exposure protocol, the McDonnell et al. (2007) curve illustrates the predicted FEV₁ decrement at 6.6 hr as a function of O₃ concentration for a 23-year-old. Error bars (where available) are the SE of responses. The data at 0.08 and 0.12 ppm have been offset for illustrative purposes.