title: Another asthma outbreak in Barcelona: role of oxides of nitrogen.
mesh_terms: D000393:Air Pollutants / Q000506:poisoning; D001249:Asthma / Q000139:chemically induced / Q000453:epidemiology*; D004196:Disease Outbreaks / Q000453:epidemiology*; D006801:Humans; D009589:Nitrogen Oxides / Q000506:poisoning*; D013030:Spain
chemical_list: D000393:Air Pollutants; D009589:Nitrogen Oxides