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AbstractFrom April 1988 to October 1991 3-year-old seed propagated beech (Fagus sylvatica L.) trees were exposed in open-top chambers to four different levels of air pollution: (1) charcoal filtered air, (2) ambient air, (3) ambient air plus 30 nl l1 ozone during the summer, and (4) ambient air plus 30 nl l1 ozone during the summer and 20 nl l1 SO2 and NO2 during the winter. Leaf colour was studied...