title: [3-4-Benzopyrene in the air of Madrid].
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D001580:Benzopyrenes / Q000032:analysis*; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology; D012621:Seasons; D013030:Spain
chemical_list: D001580:Benzopyrenes
vernacular_title: El 3.4.-benzopireno en la stmósfera de Madrid.