The effects of ozone, nitrogen dioxide, and sulfur dioxide on the experimentally induced allergic respiratory disorder in guinea pigs. 3. The effect on the occurrence of dyspneic attacks.

Pre-exposure of guinea pigs to more than 2 ppM O/sub 3/ or 40 ppM NO/sub 2/ induced severe, commonly fatal, dyspneic attacks (asthma) in animals sensitized to egg albumin antigen by intraperitoneal injection. 400 ppM SO/sub 2/ had no such effect.