title: Ozone and sulfur dioxide synergism: injury to tobacco plants.
abstract: Tobacco plants displayed ozone-type injury when exposed to mixtures of ozone and sulfur dioxide at subthreshold concentrations. The syndrome suggests synergism between ozone and sulfur dioxide that lowers thresholds to injury; exposure to the individual gases at the mixed-gas concentrations caused no symptoms.
authors.forename: H A
authors.initials: HA
authors.lastname: Menser
authors.forename: H E
authors.initials: HE
authors.lastname: Heggestad