As ozone (O3) is known to cause airway inflammation and hyperresponsiveness, we examined the effects of 03 exposure (1, 3, or 5 ppm, 2 h) on sensitization and provocation in guinea pigs sensitized with ovalbumin (OA) through the airway. In groups exposed to O3 before sensitization, 5 ppm increased the production of IgG1 antibodies and decreased the OA sensitization threshold from 0.01 to 0.002. In those exposed before provocation, 1, 3, or 5 ppm of O3 decreased the OA provocation threshold from 0.5 to 0.02, and this enhancement appeared to depend on airway hyperresponsiveness. We conclude that O3 exposure may play an important role in causing asthmatic attacks rather than enhancing allergic sensitization.
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