title: As clunkers die, carboxyhemoglobin levels in Chicago blood donors continue to fall.
mesh_terms: D000328:Adult; D002263:Carboxyhemoglobin / Q000032:analysis*; D002641:Chicago; D006801:Humans; D001335:Vehicle Emissions / Q000009:adverse effects*
chemical_list: D001335:Vehicle Emissions; D002263:Carboxyhemoglobin