title: Blood lead and zinc protoporphyrin concentrations in roadside workers employed in areas of high traffic density.
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D006801:Humans; D007854:Lead / Q000097:blood*; D008131:London; D011166:Porphyrins / Q000097:blood*; D011524:Protoporphyrins / Q000097:blood*
chemical_list: D000393:Air Pollutants; D011166:Porphyrins; D011524:Protoporphyrins; C017803:zinc protoporphyrin; D007854:Lead