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Winter wheat (cultivar Vona) was exposed to four levels of 03 (7-hr accelerated thfe loss of moisture from the heads. Ozone significantly exposure period averages of 0.027, 0.054, 0.076, and 0.096 ppm) and four reduced stomatal conductances of flag leaves, net photosynthesis of whole levels of SO 2 (4-hr exposure period averages of 0, 0.039, 0.166, and 0.363 plants and individual heads, and seed dry weights per head as a result of ppm) and all combinations of the two pollutants from anthesis until reduced seed size but not seed number. Reductions in seed weights caused harvest. Sulfur dioxide did not affect net photosynthesis or yield but by ozone were highly correlated with measured reductions in whole-plant temporarily reduced stomatal conductances of flag leaves. No interactions and individual head photosynthesis. Exposure of Vona winter wheat to ambient between SO 2 and 03 were found for any variables measured. Ozone and higher 03 concentrations from anthesis until harvest resulted in yield accelerated the senescence of flag leaves, stalks, and heads and also losses caused by reductions in net photosynthesis.