title: Letter: Photosynthesis in leaves exposed to SO2 and NO2.
mesh_terms: D000397:Air Pollution; D009566:Nitrates / Q000494:pharmacology*; D010788:Photosynthesis / Q000187:drug effects*; D010944:Plants / Q000378:metabolism*; D013431:Sulfates / Q000494:pharmacology*
chemical_list: D009566:Nitrates; D013431:Sulfates