Abstract
AbstractMesophyll cells of spruce [Picea abies (L.) Karst.] needles fumigated for two months with O3 alone and together with SO2 were studied with electron microscope. The observations showed the specific type of injuries for both pollutants, the dependency of severity of injuries both on the concentration of the pollutant and the duration of daily exposure as well as enhanced effects with combined O3 and SO2 in the older needles.
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