title: Ambient CO levels and cardiorespiratory complaints.
mesh_terms: D000393:Air Pollutants / Q000009:adverse effects*; D002248:Carbon Monoxide / Q000009:adverse effects*; D006331:Heart Diseases / Q000139:chemically induced*; D006801:Humans; D010507:Periodicity; D012140:Respiratory Tract Diseases / Q000139:chemically induced*
chemical_list: D000393:Air Pollutants; D002248:Carbon Monoxide