Catalyst-equipped cars, oxides of sulfur, and respiratory tract irritation.
D001336:Automobiles; D006801:Humans; D012140:Respiratory Tract Diseases / Q000139:chemically induced*; D013461:Sulfur Oxides / Q000506:poisoning*; D001335:Vehicle Emissions / Q000506:poisoning*
D013461:Sulfur Oxides; D001335:Vehicle Emissions