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EPR investigations of spruce needles under in vivo conditions are capable of the detection of several radicals attributed to the plant photosystem . Furthermore, at room temperature an absorption due to ascorbic acid radical and other paramagnetic oxidation products can be de­tected additionally in the dark-adapted needles as well as under illumination. A systematic in­vestigation of the ascorbic acid signal intensity in spruce needles grown in the vicinity of air quality control units indicates two different oxidative mechanisms, depending on the state of illumination. Ozone plays a key role but is not the hazardous agent monitored by the ascorbic radical immediately. However, its signal reflects the present state of the antioxidative system in the needles and provides an early and simple diagnosis of the oxidative interactions of air pol­lutants with the photosynthetic apparatus of big trees.

Ascorbic Acid as Indicator of Damage to Forest. A Correlation with Air Quality