Abstract

Rats and guinea pigs were exposed to 0.5 ppm O3, 10 mg/m3 sulfuric acid (H2SO4) mist, or their combination for 6 h/d, 5 d/wk for 6 mo. Microscopic alterations were seen in the lungs of guinea pigs exposed to O3 alone or in combination with H2SO4 mist. No other microscopic lesions were present in either rats or guinea pigs. No biologically meaningful synergistic effects were noted in animals exposed to the combination of O3 and H2SO4 mist.

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