title: Letter: Carboxyhaemoglobin: environmental and constitutional factors.
mesh_terms: D000397:Air Pollution; D001824:Body Constitution; D002248:Carbon Monoxide / Q000097:blood* / Q000378:metabolism; D002263:Carboxyhemoglobin / Q000032:analysis*; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D008131:London; D012907:Smoking
chemical_list: D006454:Hemoglobins; D002248:Carbon Monoxide; D002263:Carboxyhemoglobin