title: Biological method of estimating smoke and sulphur dioxide pollution.
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D004739:England; D063245:Plant Development; D012906:Smoke / Q000032:analysis*; D013458:Sulfur Dioxide / Q000032:analysis*; D014197:Trees; D014852:Wales
chemical_list: D012906:Smoke; D013458:Sulfur Dioxide