title: Spanish moss as an indicator of lead in the atmosphere before the use of leaded gasoline.
mesh_terms: D000397:Air Pollution; D004787:Environmental Pollution; D007854:Lead / Q000032:analysis*; D013058:Mass Spectrometry; D010944:Plants / Q000032:analysis*; D012906:Smoke; D013054:Spectrophotometry, Atomic; D001335:Vehicle Emissions
chemical_list: D012906:Smoke; D001335:Vehicle Emissions; D007854:Lead