title: Respiratory effects of exposure to ozone plus sulfur dioxide in Southern Californians and Eastern Canadians.
abstract: Volunteer subjects were exposed in an environmentally controlled chamber in Los Angeles to SO2 and O3, separately and in combination, to study the enhanced toxicity of the O3 + SO2 mixture observed in a previous study in Montreal. Toxic responses to O3 + SO2 were less severe than observed previously, and only slightly more severe than with O3 alone. Sulfur-containing aerosols formed by chemical reactions within the chamber air may have contributed to the O3 + SO2 responses in the Montreal study. Adaptation of Los Angeles residents to ambient O3 may also contribute to response variability.
mesh_terms: D002140:California; D004781:Environmental Exposure; D005541:Forced Expiratory Volume; D006801:Humans; D010126:Ozone / Q000009:adverse effects*; D011792:Quebec; D012119:Respiration / Q000187:drug effects*; D013458:Sulfur Dioxide / Q000009:adverse effects*; D014797:Vital Capacity
chemical_list: D013458:Sulfur Dioxide; D010126:Ozone